What labs should I monitor if I'm on TRT?

Men on TRT should have monitoring labs every 3–6 months initially and annually once stable: (1) total testosterone (target 400–700 ng/dL) + free testosterone + SHBG; (2) hematocrit/CBC, the most important safety lab on TRT; (3) estradiol (E2), TRT increases aromatization, potentially requiring anastrozole or dose reduction if symptomatic; (4) PSA, annual for men over 40; (5) blood pressure; (6) lipid panel + ApoB, testosterone can reduce HDL and alter lipid profile (Bhasin et al., J Clin Endocrinol Metab, 2010).

The hematocrit is the most critical monitoring parameter for cardiovascular safety: TRT stimulates erythropoiesis, and hematocrit above 54% significantly increases blood viscosity and thromboembolism risk. The clinical thresholds: hematocrit 50–54%, dose reduction, increased hydration; above 54%, hold TRT, phlebotomy, resume at lower dose only after normalization. Men at higher polycythemia risk (sleep apnea, high altitude living, chronic lung disease) need more frequent monitoring.

Honesty Scale: Solid (1) for these monitoring parameters as the clinical standard.

What to do: If you are on TRT and your physician is not ordering a hematocrit at every follow-up visit, request one. This is the one monitoring parameter most likely to have been inadequately tracked in telehealth-prescribed TRT contexts.

For the full picture, read The Testosterone/TRT Deep Dive