/WHAT_IT_IS
Creatinine is a muscle breakdown product cleared by the kidneys. It's the simplest kidney function marker, but heavily influenced by muscle mass.
/NORMAL_RANGE
Reference: 0.7–1.3 mg/dL. Higher in muscular men — don't panic at 1.3–1.5 if you're built.
What does high Cr mean?
- +Kidney dysfunction, dehydration, high muscle mass, recent intense exercise, high protein meal, creatine supplementation.
What does low Cr mean?
- +Low muscle mass, severe liver disease.
/ON_TRT
TRT increases muscle mass, which raises creatinine independently of kidney function. Use eGFR (which accounts for age/sex) rather than creatinine alone, and cystatin C if you want a truly muscle-independent kidney marker.
/RELATED
/TRACK_THIS
Track Cr in the app.
Upload your lab PDF — MyTRT extracts every marker with Gemini Vision. Charts, trends, and TRT-aware insights. Free on iOS and Android.