High muscle mass and creatine supplements raise creatinine, but genuine kidney injury has also been reported with androgen use.
Why creatinine can mislead
Creatinine reflects muscle mass as well as kidney filtration. Muscular people and creatine users can show reduced estimated filtration without kidney damage.
Cystatin C or urine tests can help clinicians separate the two.
Real kidney harm
Case series describe focal segmental glomerulosclerosis in long-term anabolic steroid users, sometimes with heavy proteinuria.
Dehydration, NSAIDs and very high protein intakes add strain.
Practical approach
Tell the clinician about muscle mass, supplements and substances so results are interpreted correctly. Foamy urine, swelling or reduced urine output warrant review.
In short
- Creatinine alone can over- or under-state kidney risk.
- Kidney injury has been documented with androgen use.
- Full disclosure helps accurate interpretation.
Cited studies
These studies provide context for the article; findings may not apply to non-medical use or products sold online.
Herlitz LC, Markowitz GS, Farris AB, et al. (2010). Development of focal segmental glomerulosclerosis after anabolic steroid abuse. Journal of the American Society of Nephrology.
Read the study ↗Davani-Davari D, Karimzadeh I, Khalili H. (2019). The potential effects of anabolic-androgenic steroids and growth hormone as commonly used sport supplements on the kidney: a systematic review. BMC Nephrology.
Read the study ↗
Unfamiliar terminology is defined in our glossary. How we research and grade evidence is set out in our editorial standards, and errors can be reported through corrections.
This article is educational. It is not medical advice, a dosing recommendation, or an endorsement of use. Speak with a qualified medical practitioner about your circumstances.