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TRT and Kidney Disease: What Testosterone Does to Creatinine, eGFR, and Your Kidneys

Last verified: October 2026 · By TRT Provider Guide Editorial Team · Editorial research, not clinically reviewed

Last updated: .

Affiliate disclosure: TRT Provider Guide may earn compensation through certain provider links. Commercial relationships do not change our editorial conclusions. Full disclosure.

TRT and kidney disease can go together, but not on autopilot. Testosterone can raise creatinine partly through changes in muscle mass, which can make a creatinine-based eGFR look worse than true kidney filtration. Real risks exist too: in the largest testosterone safety trial, acute kidney injury was reported more often with testosterone than placebo (2.3% vs 1.5%). If you have kidney disease, your kidney clinician should be part of the decision.

Here's the part many men never hear: creatinine is only one piece of the kidney picture. Cystatin C, a combined creatinine-cystatin C eGFR, urine albumin, blood pressure, and the trend over time can help your clinician tell whether a creatinine change is mostly a measurement problem or a sign that needs a kidney workup.

What changes the answer:

  • No known kidney disease, but creatinine went up on TRT: Don't panic, and don't shrug it off. Ask whether cystatin C, a combined eGFR, and urine albumin testing would help clarify the change.
  • Known chronic kidney disease (CKD) stage 3 or higher, dialysis, or a transplant: Don't start, stop, or change testosterone without your kidney team.
  • Sudden swelling, shortness of breath, or very little urine: Get urgent or emergency care today.

Educational information, not medical advice. This page can't diagnose kidney disease or low testosterone, and it can't read your lab results for you. Use it to ask better questions.

TRT Provider Guide is the independent decision resource for testosterone replacement therapy — helping U.S. adults understand how low testosterone is evaluated, compare online and local care models and providers, and choose the next step that fits their health needs, fertility plans, budget, state, and care preferences, with every material claim verified and dated.

The right TRT provider is not the same for every person — it depends on whether low testosterone has been properly evaluated, your symptoms and health history, your fertility plans, your state, your insurance or cash-pay preference, your treatment-format preference, your budget, and whether online or in-person care is the better starting point. Some situations belong with primary care, urology, endocrinology, reproductive urology, or urgent or emergency care when the symptoms warrant it. Kidney disease is one of those situations, and nephrology belongs in that decision. Because a general answer cannot resolve those for you, use TRT Provider Guide's Find My TRT Path tool to map your situation to the right care route and the questions to ask before you pay.

Map the care route that fits your kidneys → Find My TRT Path

Find your situation first

TRT and kidney disease: creatinine, labs, evidence and care routes table 1: Find your situation first
If you… Your most useful next step
Are on TRT and your creatinine rose or your eGFR dipped Ask whether cystatin C, a combined eGFR, urine albumin, and repeat testing would help clarify the change
Have early CKD (stage 1–2) and possible low-testosterone symptoms Confirm low T with symptoms or signs plus repeat morning testing, and make sure the clinician managing your CKD knows treatment is being considered
Have CKD stage 3a or higher Make TRT a coordinated decision with the clinician managing your kidney disease and the clinician evaluating low testosterone; nephrology involvement is especially important when kidney function is declining, albuminuria is substantial, or CKD is advanced
Are on dialysis or have a kidney transplant Start with your dialysis or transplant team; a general online TRT program should not lead this decision
Have had recurrent or significant kidney stones Tell the clinician managing your stones before starting; one large observational study linked TRT with more stone events but could not prove testosterone caused them

What we actually verified (October 26, 2026)

Medical and regulatory sources checked: FDA (2025 class-wide testosterone labeling change), FDA-approved testosterone labeling, the American Urological Association (AUA) and Endocrine Society testosterone guidelines, the KDIGO 2024 chronic kidney disease guideline, the National Kidney Foundation, the TRAVERSE trial, and the peer-reviewed kidney studies listed in our sources.

What no current evidence shows: That TRT is proven safe for everyone with CKD, that TRT improves kidney function, or that a creatinine rise on TRT is always harmless.

Does TRT affect your kidneys?

TRT can affect kidney-related lab numbers and can also affect factors that matter to kidney health. Testosterone-related changes in muscle mass can raise creatinine and lower a creatinine-based eGFR without proving that true filtration fell. Testosterone can also raise blood pressure and promote fluid retention. In the 5,246-man TRAVERSE trial, acute kidney injury was reported more often with testosterone gel than placebo (2.3% vs 1.5%).

Here's the short list of kidney-related effects worth knowing:

  • Creatinine can go up. Added muscle, creatine use, hard exercise, meat intake, medicines, and kidney function can all affect the number. More on that below.
  • Blood pressure can go up. In February 2025, the FDA required blood pressure warnings on all testosterone products after blood pressure monitoring studies confirmed the rise across the whole class. High blood pressure is a major driver of kidney decline.
  • Fluid can build up. FDA-approved testosterone labels warn that swelling (edema), with or without heart failure, may be a serious problem in people who already have heart, kidney, or liver disease.
  • Acute kidney injury was reported more often in TRAVERSE (2.3% vs 1.5%). Acute kidney injury, or AKI, is a sudden decline in kidney function; this secondary-event signal does not by itself prove testosterone caused each event.
  • Kidney stones may be more common. One large military health study found more stone events in men on TRT.
  • Red blood cells go up. That matters a lot in CKD, where many people are anemic and take drugs that also raise red cells.

The same FDA update removed the boxed-warning language about increased heart attack and stroke risk after reviewing TRAVERSE, while adding class-wide blood pressure warnings. That does not settle the kidney question.

For the full side-effect picture beyond kidneys, see TRT side effects.

Why does creatinine go up on TRT? (Testosterone and creatinine)

Creatinine is a waste product influenced by muscle metabolism and diet. Testosterone can increase lean mass, so a rise in creatinine after treatment may partly reflect more creatinine production rather than a matching fall in kidney filtration. A standard creatinine-based eGFR can therefore drop on paper even when true kidney function has changed less—or not at all.

Think of it like traffic. More muscle means more creatinine "cars" on the road. The highway (your kidneys) may be just as wide as ever. It just looks busier.

The National Kidney Foundation lists several things that can push creatinine up without kidney damage:

  • High muscle mass
  • Taking creatine supplements
  • Recent high-intensity exercise
  • Eating large amounts of cooked meat

Many men who use TRT also lift weights, eat high-protein diets, or take creatine, so these confounders are easy to miss.

How big is the effect in the best-studied group? Most direct data on this question come from transgender men starting testosterone rather than cisgender men receiving TRT for hypogonadism. A 2022 systematic review found a mean creatinine increase of about 0.15 mg/dL at 12 months; one cohort reported about 0.21 mg/dL at six months. A 2025 meta-analysis also found creatinine-based eGFR tended to fall while BUN remained stable, which the authors interpreted as more consistent with increased creatinine production than proven loss of filtration. These numbers should not be treated as an expected creatinine rise for every man on TRT.

A note on who was studied. Most of this research followed transgender men starting testosterone, because they're tested closely when therapy begins. It's strong evidence about how testosterone moves creatinine. It isn't a perfect stand-in for men on TRT, whose starting muscle mass and doses differ.

Here's the rule we'd tape to the fridge: a creatinine change is a clue, not a cause.

Can TRT make your eGFR look lower?

Yes. A creatinine-based eGFR (estimated glomerular filtration rate) is calculated from creatinine, age, and sex. When creatinine rises because of higher creatinine production rather than lower filtration, the calculated eGFR can fall even if true kidney filtration has not fallen by the same amount.

To show how fast that happens, we ran the numbers through the same 2021 CKD-EPI creatinine equation U.S. labs use. These are for a 45-year-old man. This is an illustration, not your result.

TRT and kidney disease: creatinine, labs, evidence and care routes table 2: Can TRT make your eGFR look lower?
Creatinine (mg/dL) Calculated eGFR (mL/min/1.73 m²) What a lab report might suggest
1.00 ~95 Normal
1.15 (a rise of 0.15, matching the 12-month mean in the transgender-men meta-analysis above) ~80 "Mildly decreased"
1.30 ~69 "Mildly decreased"
~1.46 ~60 The line where CKD becomes possible if it lasts 3+ months

Look at the second row. A 0.15 mg/dL creatinine rise in this example drops the calculated eGFR by about 15 points, from roughly 95 to 80. That mathematical change can happen without an equal drop in true filtration, which is why the result needs context instead of an automatic diagnosis.

Now flip it. That same math means a real kidney problem can hide inside a "muscle explanation." A 15-point drop and a 15-point drop look identical on paper. Only better tests tell them apart.

CKD requires abnormalities of kidney structure or function present for at least three months. An eGFR below 60 for that duration can meet the definition; at higher eGFR levels, markers of kidney damage such as persistent albuminuria can establish CKD. One abnormal result does not establish chronicity.

Which tests help separate a creatinine effect from kidney disease?

No single blood test can prove that a creatinine change is "just muscle." Cystatin C and a combined creatinine-cystatin C eGFR can improve GFR estimation when creatinine is less reliable, including with unusual muscle mass, while a urine albumin-to-creatinine ratio (uACR) checks for albuminuria, an important marker of kidney damage. The 2024 KDIGO guideline recommends using creatinine plus cystatin C when cystatin C is available for CKD staging and specifically discusses alternative estimates when muscle mass makes creatinine less reliable.

Cystatin C in plain English: It's a small protein used as another filtration marker and is much less tied to muscle mass than creatinine. A better cystatin C-based estimate when creatinine looks worse can support the idea that creatinine production is distorting the picture, but cystatin C has its own non-kidney influences. If both creatinine- and cystatin C-based estimates worsen, that deserves closer clinical review rather than a muscle-only explanation.

The combined eGFR (eGFRcr-cys): Uses both markers together. It's more accurate than either alone, which is why KDIGO leans on it when the stakes are real.

Urine albumin-to-creatinine ratio (uACR): This checks whether excess albumin, a protein, is leaking into your urine. Persistent albuminuria is a marker of kidney damage and adds information that a creatinine-only eGFR cannot provide. KDIGO classifies CKD using both GFR category and albuminuria category.

What none of these can do alone: Cystatin C has its own quirks, and no single result explains a trend. Your clinician puts them together with your blood pressure, history, and repeat tests.

Will insurance pay for cystatin C? Coverage varies by insurer and clinical indication. Ask the ordering office or insurer what your plan covers before the draw.

Our kidney lab decoder for men on TRT

We built this table so you can see every kidney-related number in one place: what it measures, how testosterone can move it, and what to ask. It's educational, not a reading of your results.

TRT and kidney disease: creatinine, labs, evidence and care routes table 3: Our kidney lab decoder for men on TRT
Test What it measures Can testosterone move it? Does a change mean kidney damage? What to ask
Serum creatinine Waste marker influenced by muscle metabolism and diet, cleared by kidneys It can rise as muscle mass or creatinine production changes Not by itself "Could muscle mass, creatine, exercise, diet, medicines, or kidney function explain this trend?"
eGFR (creatinine-based) Filtration estimated from creatinine, age, and sex It falls mathematically as creatinine rises Not by itself "Would cystatin C or a combined eGFR improve the estimate in my case?"
Cystatin C / combined eGFR Filtration estimate less dependent on muscle mass than creatinine alone Usually less affected by muscle mass, but cystatin C has other non-GFR influences A worsening result adds concern but still needs clinical context "Would a combined creatinine-cystatin C eGFR be more accurate for me?"
Urine albumin-to-creatinine ratio Albumin leaking into urine Not a muscle-mass measure Persistent albuminuria is a marker of kidney damage "Can we check uACR and, if abnormal, confirm whether it persists?"
BUN Nitrogen waste influenced by protein intake, hydration, catabolism, and kidney function No established predictable TRT effect A stable BUN does not prove a creatinine rise is harmless Context only
Hemoglobin / hematocrit Red blood cell level Yes, testosterone can raise it Not a kidney-function test, but important in CKD and anemia care "Who is tracking this alongside my other medicines and CKD treatment?"
Blood pressure Pressure in your blood vessels Testosterone products now carry class-wide warnings about increased blood pressure Poorly controlled blood pressure is a kidney and cardiovascular risk factor "How should my blood pressure be monitored after treatment starts?"
Weight and swelling Possible fluid retention Testosterone labeling warns about edema, especially with pre-existing cardiac, renal, or hepatic disease New or worsening edema needs clinical assessment; it does not identify the cause by itself "What swelling or weight change should prompt a call?"

Can TRT damage your kidneys?

Current evidence does not establish that properly prescribed TRT causes chronic kidney disease in typical patients. Two signals still deserve attention: TRAVERSE reported more acute kidney injury events with testosterone than placebo (2.3% vs 1.5%), and a large observational military-health study found more kidney stone events in men receiving TRT. Testosterone products also now carry class-wide warnings about increased blood pressure, an important risk factor for kidney and cardiovascular disease.

What TRAVERSE found, and what it didn't

TRAVERSE was the biggest placebo-controlled testosterone trial ever run: 5,246 men aged 45 to 80 with low testosterone and heart risk, using daily 1.62% testosterone gel or a placebo gel. Testosterone didn't raise major heart attack or stroke risk. But acute kidney injury showed up in 2.3% of the testosterone group versus 1.5% on placebo.

In plain numbers, the absolute difference between 2.3% and 1.5% is 0.8 percentage points—about one additional reported AKI event per 125 participants if the difference were causal. TRAVERSE was not designed to prove why that difference occurred, and later analyses have treated AKI as a signal that needs follow-up rather than a settled causal effect.

TRT and kidney stones

A study of 26,586 matched pairs of TRICARE beneficiaries aged 40 to 64 found 659 stone-related events in the TRT group versus 482 in the untreated group within two years. The association was significant for topical and injection therapy, but not pellets. Because this was observational, it shows an association—not proof that testosterone caused the stones.

A small study that shows why "it's just muscle" isn't automatic

A 2025 prospective study measured kidney filtration directly with iohexol clearance in 21 people starting masculinizing testosterone therapy. After three months, measured GFR and kidney perfusion did not significantly change, while urine YKL-40 rose 134% and plasma TNFR-1 rose 8%. The authors described those biomarker changes as possible subclinical kidney stress; the long-term meaning is unknown, and this population is not a direct stand-in for cisgender men receiving TRT for hypogonadism.

And there's a published case report worth knowing about, even though it's one person. A 14-year-old with stage 3 CKD was given testosterone to start puberty. Both creatinine and cystatin C worsened, so muscle couldn't explain it. Function improved when testosterone stopped, then worsened again when it was restarted. A teenager receiving testosterone to start puberty is very different from an adult on TRT. But this case shows why a falling cystatin C deserves attention, not a shrug.

Our TRT and kidney evidence ledger

We pulled every meaningful human study on testosterone and kidney outcomes into one table, with what each one can and can't prove.

TRT and kidney disease: creatinine, labs, evidence and care routes table 4: Our TRT and kidney evidence ledger
Finding Study type and size Who was studied What it shows What it can't prove
Acute kidney injury 2.3% vs 1.5% TRAVERSE randomized trial, 5,246 men Men 45–80 with low T and heart risk Small but real increase in kidney injury Why it happened
Blood pressure rises class-wide FDA review of blood pressure monitoring studies, 2025 All FDA-approved testosterone products BP warning now required on every product How much your BP will change
Kidney stone events: 659 vs 482 at 2 years (26,586 men per group) Matched cohort, 53,172 men TRICARE beneficiaries 40–64 More stones on TRT (gels, injections) Cause
Creatinine +0.15 mg/dL at 12 months Systematic review/meta-analysis Transgender men starting testosterone Creatinine commonly increases in this population Same size effect in cisgender men on TRT, or that filtration is unchanged in every case
True filtration unchanged at 3 months; stress markers up Prospective study, 21 people Transgender men starting testosterone Reassuring filtration; open questions Long-term meaning
Creatinine and cystatin C both worsened, then recovered off testosterone Single case report 14-year-old with stage 3 CKD Testosterone can reduce kidney blood flow in some people Anything about typical adults
Lower all-cause mortality association (hazard ratio 0.78) Propensity-matched cohort, 3,090 men, 2026 Men with CKD stage 3–5 and coded hypogonadism Lower mortality association; no significant differences in measured cardiovascular outcomes, prostate cancer, or dementia That TRT caused the mortality difference, improved kidney function, or is safe for every person with CKD
No significant fluid overload or PSA change Small study, 29 treated men, 2022 CKD stage 2–4 and hemodialysis Short-term feasibility Long-term safety

Can you take TRT if you have kidney disease?

Sometimes, yes. Kidney disease itself is not on the Endocrine Society's list of conditions in which testosterone should not be started, but that guideline is not a kidney-safety endorsement. The decision depends on why testosterone is being considered, the cause and severity of CKD, blood pressure, fluid status, other conditions, and the treatments already being used; more advanced or unstable CKD deserves coordinated kidney-specialist care.

What the guidelines do and don't say

The Endocrine Society recommends against starting testosterone in men planning fertility soon, or in men with breast or prostate cancer, certain prostate findings without urology evaluation, elevated hematocrit, untreated severe sleep apnea, severe urinary symptoms, uncontrolled heart failure, a heart attack or stroke in the last six months, or a clotting disorder. Kidney disease isn't on that list.

That's not the same as "safe." FDA labels still warn about fluid retention in kidney disease. And CKD often travels with conditions that are on the list, like heart failure.

What the newest CKD study found

In March 2026, researchers published the largest look yet at TRT in CKD. They matched 1,545 men with CKD stage 3 to 5 and low testosterone who started TRT against 1,545 similar men who didn't. Average eGFR was about 48. Over a median 3.7 years:

  • Death rates were lower in the TRT group (hazard ratio 0.78).
  • That held in each subgroup: stage 3a (2.58% vs 5.16%), stage 3b–5 (11.91% vs 19.49%), and men who had recently started dialysis.
  • There were no significant differences in strokes, heart attacks, heart failure, prostate cancer, or dementia.
  • Before matching, TRT exposure was less common than no TRT exposure in the database; that treatment-selection difference is one reason the authors used propensity matching.

Now the honest part. This study looked backward at medical records. Men who got TRT may have been healthier in ways the records didn't capture. It didn't track whether kidney disease got worse. It shows a link, not proof that testosterone helps people live longer. It's encouraging. It's not a green light.

Our CKD stage and TRT care-route matrix

This is our editorial guide to who should lead the decision at each stage, based on the evidence above and FDA labeling. It's a map for the conversation, not a ruling on your case.

TRT and kidney disease: creatinine, labs, evidence and care routes table 5: Our CKD stage and TRT care-route matrix
Your kidney situation What the evidence says Biggest watch-outs Who should lead Is an online TRT program a sensible route?
No known CKD; creatinine rose on TRT Muscle mass and other non-kidney factors can distort creatinine, but kidney disease cannot be ruled out from that explanation alone Consider repeat testing, cystatin C/combined eGFR, uACR, BP, and the full clinical context Primary care or current prescriber; nephrology if the pattern is concerning or diagnosis is unclear Potentially, after the kidney change is appropriately evaluated
CKD stage 1–2 (eGFR 60+ with persistent kidney-damage markers) Direct TRT evidence is limited BP, albuminuria trend, fluid status, other CKD risks Primary care may manage many cases; involve nephrology when the diagnosis, risk, or complications warrant it Potentially, but only after confirmed hypogonadism and a plan to monitor the kidney condition
CKD stage 3a (eGFR 45–59) A 2026 observational cohort found no excess in several measured safety outcomes and a lower mortality association; it did not test CKD progression BP, edema, AKI risk, albuminuria, hematocrit, comorbid heart disease Coordinate the testosterone prescriber with the clinician managing CKD; nephrology involvement depends on CKD risk, cause, trend, and complications Do not use an online program as a substitute for CKD evaluation or management
CKD stage 3b–4 (eGFR 15–44) Evidence is observational or small; uncertainty rises as kidney function worsens Fluid status, heart failure, BP, anemia treatment, CKD progression Nephrology should be part of the decision; endocrinology or urology may also be appropriate for the hormone diagnosis Start with specialist-led CKD and hypogonadism evaluation rather than a general online program
CKD stage 5 or dialysis Data are limited, including small studies and observational cohorts Fluid balance, BP, anemia treatment, cardiovascular risk Your dialysis/nephrology team should lead and coordinate any hormone specialist input No general online TRT program should lead this decision
Kidney transplant Hormone levels may change after transplantation, but treatment decisions must account for graft function and immunosuppressive care Graft function, drug interactions, cardiovascular risk, fertility, and the cause of persistent hypogonadism Your transplant team should lead and coordinate hormone care No general online TRT program should lead this decision
Recurrent or significant kidney stones One large observational study found more stone events with TRT Stone type, metabolic workup, recurrence risk, and other causes Primary care or urology depending on the stone history Potentially, but TRT should not replace a proper stone evaluation

Dialysis and TRT

Low testosterone is common in advanced CKD and dialysis populations. Small studies of testosterone in dialysis patients exist, including a 2022 study that did not find a statistically significant increase in fluid overload during follow-up, but those data are too small to establish long-term safety. Fluid balance, blood pressure, anemia treatment, cardiovascular risk, and the reason for testosterone treatment all belong in a dialysis-team decision.

After a kidney transplant

Testosterone levels can improve after successful kidney transplantation in some men, but persistent symptoms and low levels still need a standard hypogonadism evaluation. Transplant drugs, graft function, cardiovascular risk, fertility, and rejection monitoring make testosterone treatment a transplant-team decision rather than a routine telehealth one.

Still unsure where you fit? Get your personalized TRT action plan: the care route that matches your kidney situation, and the questions to ask before you pay. Use Find My TRT Path →

Is low testosterone common with kidney disease, and how is it diagnosed?

Yes. Testosterone deficiency is common in published CKD populations, especially as kidney disease becomes more advanced, but reported prevalence varies widely by population and definition. Fatigue, low sex drive, and low energy can also come from CKD itself, anemia, sleep problems, and medicines. A diagnosis of hypogonadism still needs compatible symptoms or signs plus consistently low testosterone confirmed with appropriate repeat morning testing.

CKD can disrupt the hypothalamic-pituitary-gonadal axis—the hormone signaling system that regulates testosterone production—and advanced kidney disease can alter prolactin and testicular function. Some hormonal abnormalities can improve after successful transplantation, but the cause of low testosterone still needs individual evaluation.

Here's why diagnosis is trickier with CKD:

  • Symptoms overlap. Being tired all the time could be low T, anemia, poor sleep, or CKD itself.
  • One number isn't enough. The AUA uses a total testosterone below 300 ng/dL as a reasonable cutoff, but only alongside symptoms or signs and at least two early-morning tests. The Endocrine Society also calls for repeat morning testing.
  • Free testosterone can matter in selected cases. Total testosterone measures bound plus unbound hormone. The Endocrine Society recommends free testosterone when indicated, using an accurate method, because changes in binding proteins can make total testosterone harder to interpret.

If low testosterone has not been confirmed appropriately, repeat morning testing is part of the diagnostic workup before treatment is decided. See why TRT needs two low testosterone tests and the blood tests required before TRT.

TRT, anemia, and hematocrit when you have CKD

Testosterone stimulates red blood cell production, which matters in CKD because anemia and erythropoiesis-stimulating agents (ESAs) are common parts of advanced CKD care. Observational research has linked testosterone deficiency with anemia and ESA hyporesponsiveness, while testosterone itself can raise hematocrit. That makes coordinated blood-count monitoring important when both issues are being managed.

Hematocrit is the percentage of your blood volume made up of red blood cells. Both anemia and treatment-related erythrocytosis can matter clinically, but symptoms such as fatigue or shortness of breath are not specific enough to diagnose either one.

  • The AUA says clinicians should measure hemoglobin and hematocrit before offering testosterone and warn patients about the risk of too many red cells.
  • The Endocrine Society recommends against starting testosterone when hematocrit is already elevated.
  • A Cochrane review found too little evidence to use androgens as a treatment for the anemia of CKD. Testosterone is not an anemia drug.
  • SGLT2 inhibitors, which KDIGO recommends for many people with CKD when indicated, can also increase hematocrit. That is another reason the clinician managing CKD should know about testosterone treatment and vice versa.

The practical point: Whoever prescribes your testosterone needs to know every medicine you take that raises red cells. If two doctors are managing your blood counts separately, connect them.

Does the type of testosterone matter for your kidneys?

No testosterone product is proven "kidney-safe." In 2025, FDA required blood-pressure warnings across testosterone products, and FDA-approved testosterone labels warn that edema can be a serious complication in people with pre-existing renal disease. Compounded testosterone is not FDA-approved and does not have FDA-approved prescribing information establishing its safety or effectiveness.

Here's how the main categories line up:

  • FDA-approved injections (testosterone cypionate, testosterone enanthate, and long-acting testosterone undecanoate) and FDA-approved gels, nasal gel, pellets, and oral capsules all went through FDA review and carry official labels. That includes the 2025 blood pressure warnings.
  • Oral testosterone undecanoate products have FDA-approved prescribing information with formulation-specific warnings and interactions, including cautions about fluid retention with corticosteroids in people with cardiac, renal, or hepatic disease. See our oral testosterone guide.
  • Compounded testosterone is mixed by a compounding pharmacy for an individual prescription. It is not FDA-approved, and the FDA hasn't evaluated it for safety, effectiveness, or quality. It isn't the same as an FDA-approved product.

If insurance matters to you, coverage depends on the specific FDA-approved product, diagnosis, plan rules, prior authorization, and pharmacy benefit. See does Medicare cover TRT and testosterone prior authorization.

Should you stop TRT if your creatinine is high or your eGFR drops?

Don't stop, restart, or change prescribed testosterone on your own because of one lab result. A falling eGFR deserves a real review that may include repeat testing, cystatin C or a combined eGFR, urine albumin, medication review, blood pressure, and other evaluation based on the clinical picture. Your prescriber and the clinician managing your kidney health should look at the trend together.

Stopping prescribed treatment on your own is not a kidney diagnosis, and ignoring a real decline is not safe either. The useful middle path is to confirm what changed, look for other causes, and make the treatment decision with the clinicians responsible for both problems.

The exception is urgent symptoms. Sudden swelling, trouble breathing, or passing very little urine means urgent care first and lab questions later.

What to bring to your next appointment

The fastest way to a clear answer is walking in with the full picture. Here's our checklist.

Your before-and-after numbers

TRT and kidney disease: creatinine, labs, evidence and care routes table 6: What to bring to your next appointment
Bring Before TRT On TRT now
Creatinine and eGFR ✓ ✓ (all results in between, too)
Cystatin C, if you've had it ✓ ✓
Urine albumin-to-creatinine ratio, if you've had it ✓ ✓
Hemoglobin and hematocrit ✓ ✓
Blood pressure readings ✓ ✓ (a home log is ideal)
Testosterone results and dates ✓ ✓

Your context

  • Your exact testosterone product, dose schedule, and whether it's FDA-approved or compounded
  • Every other prescription, especially blood pressure drugs, NSAID pain relievers, steroids, ESAs, and SGLT2 inhibitors
  • Creatine or other supplements
  • Recent hard exercise or a large cooked-meat meal that could affect creatinine interpretation
  • Any known CKD stage and cause
  • Any swelling, weight jumps, or changes in how much you urinate
  • Any history of kidney stones

Questions to ask

  1. "Could muscle mass or another non-kidney factor be affecting my creatinine, and would cystatin C or a combined eGFR help?"
  2. "Can we check urine albumin to look for another marker of kidney damage?"
  3. "Is my blood pressure where it needs to be on testosterone?"
  4. "Who is watching my hematocrit, especially with my other medicines?"
  5. "Based on my CKD stage, albuminuria, trend, and other risks, should nephrology be involved?"
  6. "What follow-up testing makes sense for my kidney condition and treatment plan?"

Want help organizing the next step? TRT Provider Guide's Find My TRT Path tool is educational and non-diagnostic. It can help you map your situation to a care route and build questions for your next visit. Use Find My TRT Path →

What should you ask any TRT program about kidney monitoring?

An online TRT program should not be the first place you try to settle an unexplained kidney problem. If your kidney status has already been evaluated and a clinician says telehealth TRT is a reasonable care route, ask what labs are checked before treatment, how abnormal kidney results are handled, who monitors blood pressure and hematocrit, and when the program refers out instead of prescribing.

Testosterone is a Schedule III controlled substance in the United States and requires a valid prescription. Federal telemedicine flexibilities currently allow DEA-registered clinicians to prescribe Schedule II-V controlled medications by qualifying telemedicine encounters through December 31, 2026, without a prior in-person medical evaluation, provided the prescription otherwise complies with DEA requirements and applicable federal and state law. State rules and an individual clinician's practice requirements can still be stricter.

Before you pay, ask:

  1. What baseline labs do you require? A testosterone panel alone does not evaluate kidney health.
  2. If creatinine is high or eGFR is low, what happens next? The useful answer is a clinical review and appropriate follow-up—not an automatic approval or rejection.
  3. Can you coordinate with my primary care clinician or nephrologist? This matters if CKD is established or kidney markers are changing.
  4. Who monitors hematocrit and blood pressure after treatment starts? Both matter in testosterone care, and both can be especially important in CKD.
  5. Which testosterone product would I actually receive? Keep FDA-approved products and compounded testosterone clearly separated; compounded testosterone is not FDA-approved.
  6. When would you tell me to get in-person or specialist care instead? A trustworthy program should have a clear answer.

If you do not know whether an online program, primary care, urology, endocrinology, or nephrology is the right starting point, use Find My TRT Path to organize the care-route questions before comparing providers.

When should a nephrologist be involved, or when is urgent care more appropriate?

Not every person with a stable eGFR below 60 automatically needs specialist follow-up, but nephrology referral becomes more important when the cause is unclear, kidney function is falling quickly, eGFR is below 30, albuminuria is severe, complications are difficult to manage, or the treatment decision is medically complex. If you already have CKD and are considering testosterone, ask the clinician managing your kidney disease whether nephrology should be part of that decision.

Ask about nephrology referral if:

  • The cause of your CKD is uncertain
  • Your kidney function is declining rapidly or there has been a sustained major fall in GFR
  • Your eGFR is below 30 mL/min/1.73 m²
  • You have severe or rapidly increasing albuminuria, significant albuminuria with blood in the urine, or other concerning urine findings
  • CKD complications such as resistant hypertension, persistent potassium problems, acidosis, anemia, or bone disease are difficult to manage
  • You have recurrent extensive kidney stones
  • Your clinician thinks the kidney risk makes the testosterone decision too complex for routine management

Go to urgent care or the ER if:

  • You're passing much less urine than usual
  • Your legs, ankles, or face swell suddenly
  • You're short of breath, especially lying down
  • You feel confused, very weak, or have chest pain

How we built this page

Our team pulled current guidance from the FDA, the AUA, the Endocrine Society, the National Kidney Foundation, and the KDIGO 2024 kidney guideline. Then we read the major human studies on testosterone and kidney outcomes and recorded what each one can and can't prove. We kept commercial provider recommendations out of the kidney-disease decision because CKD severity, cause, albuminuria, blood pressure, fluid status, and specialist involvement matter more than choosing a telehealth brand.

The eGFR examples come from the 2021 CKD-EPI creatinine equation. The "one additional reported AKI event per 125 participants" figure is simple arithmetic from the reported 2.3% versus 1.5% rates and is not a causal estimate. The care-route matrix is editorial judgment built on the medical evidence and CKD referral guidance above. We did not use any TRT provider as an authority on kidney safety.

Read the full method: How We Review TRT Providers.

Frequently asked questions

Does TRT cause kidney damage?

Current evidence does not establish that properly prescribed TRT causes chronic kidney disease in typical patients. In TRAVERSE, acute kidney injury was reported more often with testosterone than placebo (2.3% vs 1.5%), and FDA now requires class-wide blood-pressure warnings. Kidney numbers that change on TRT deserve confirmation and clinical review, not a guess either way.

Can testosterone raise creatinine levels?

Yes. Creatinine is influenced by muscle mass, exercise, diet, supplements, medicines, and kidney filtration. In a meta-analysis of transgender men starting testosterone, creatinine rose by about 0.15 mg/dL at 12 months on average; that number should not be treated as an expected change for every man on TRT. Cystatin C and a combined eGFR can help when creatinine is hard to interpret.

Can TRT lower eGFR?

A creatinine-based eGFR can fall when creatinine rises. Using the 2021 CKD-EPI equation, a 45-year-old man with creatinine rising from 1.00 to 1.15 mg/dL would calculate from about 95 to 80 mL/min/1.73 m². Whether true kidney filtration changed requires clinical context and may call for repeat testing, cystatin C/combined eGFR, urine albumin, or other evaluation.

Should I stop TRT if my creatinine is high?

Don't stop or change prescribed testosterone on your own because of one result. Ask your prescriber what repeat testing or kidney evaluation is appropriate, which may include cystatin C/combined eGFR and urine albumin, and ask whether nephrology should be involved if the trend or CKD risk is concerning. Seek urgent care for severe or rapidly worsening symptoms such as major shortness of breath, marked swelling, chest pain, confusion, or a major drop in urine output.

Is TRT safe with stage 3 kidney disease?

It may be possible for some men with confirmed hypogonadism, but no study can promise TRT is safe for every person with stage 3 CKD. A 2026 propensity-matched cohort found a lower mortality association and no significant difference in several measured secondary outcomes, but it was observational and did not prove a kidney benefit. The hormone prescriber should coordinate with the clinician managing CKD, with nephrology involved when the kidney risk, cause, trend, or complications warrant it.

Can you take testosterone on dialysis?

Some dialysis patients have received testosterone in small studies, but those studies are too small to establish long-term safety. Fluid balance, blood pressure, anemia treatment, cardiovascular risk, and the reason for testosterone treatment all matter. Your dialysis team should lead or coordinate this decision.

Does TRT cause kidney stones?

TRT has been associated with more kidney stone events in one large observational study of 26,586 matched pairs. The association appeared in topical and injection subgroups, but the study could not prove testosterone caused the stones. If you have recurrent or significant stones, make sure the clinician managing that problem knows testosterone is being considered.

Does creatine plus TRT affect kidney tests?

It can complicate creatinine interpretation. Creatine supplements, high muscle mass, and recent intense exercise can all raise serum creatinine without an equal fall in true filtration. Tell your clinician about creatine and training habits so they can decide whether cystatin C, a combined eGFR, or other testing would improve the kidney assessment.

Does testosterone help anemia from kidney disease?

Testosterone can raise red blood cell production, and testosterone deficiency has been associated with anemia and ESA hyporesponsiveness in CKD. But evidence is insufficient to use testosterone as a routine treatment for CKD anemia. If testosterone and an ESA or another red-cell-raising therapy are both in the picture, the clinicians managing them should coordinate blood-count monitoring.

Can I get TRT after a kidney transplant?

Testosterone levels can improve after successful kidney transplantation in some men. If symptoms and consistently low testosterone remain, the usual hypogonadism workup still applies, but graft function, immunosuppressive therapy, fertility, and cardiovascular risk make this a transplant-team decision rather than a routine telehealth one.

Do online TRT clinics test kidney function?

Some programs include kidney-related markers in baseline labs and some focus mainly on hormone testing. If kidney disease or an unexplained creatinine/eGFR change is part of your situation, do not assume a standard TRT panel is enough. Ask exactly which kidney and blood-count markers are checked, how abnormal results are handled, and when the program refers you for in-person or specialist care.

Will insurance cover a cystatin C test?

Sometimes, but coverage varies by insurer and clinical indication. Ask the ordering office or your insurer before the blood draw if cost matters.

Still not sure which TRT care route fits you? Use our free Find My TRT Path tool.

Find My TRT Path is educational and non-diagnostic. It doesn't diagnose low testosterone or kidney disease, decide whether testosterone is right for you, or replace care from your clinician.

Related guides: Who should not take TRT · TRT and diabetes · TRT and liver health · TRT and cholesterol

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