Creatinine and Cystatin C: A Measure of Renal Function in Men With Testosterone-Induced Muscle Hypertrophy.

Creatinine (Cr) is often used as a standalone gold standard marker of kidney function. Cystatin C (Cys C) is a less physiologically labile marker of renal function, particularly in certain subgroups. Herein, we analyze trends in cystatin C as compared to creatinine in men on testosterone replacement therapy with varying body mass indices and percent body fat (PBF). This retrospective analysis observes 227 men with testosterone-induced muscle hypertrophy who visited a men's health tertiary care clinic. All participants were characterized as competitive or recreational athletes. In patients with a normal body mass index (BMI), there was no clinically significant correlation between Cr and Cys C. Slight correlation was seen with overweight ( = .27) patients ( < .0001) and obese ( = .29) patients ( < .0001). Patients with PBF of 0%-10% ( = 22) exhibited minimal ( = .23) positive correlation between Cys C and Cr ( = .03). Positive correlation between Cys C and Cr in patients with PBF of 10%-20% was clinically negligible ( = .17,  = 87), modest ( = .49) in patients with PBF of 20%-30% ( = 42), and evident ( = 1.00) in patients >30% ( = 3) ( < .0001, respectively). Cystatin C measurements display less variance compared with creatinine at differing BMI distinctions. At the upper limit of BMI or PBF in our patient population, cystatin C exhibits minimal to moderate variability compared with creatinine.