Hematocrit measures the proportion of red blood cells in blood. Testosterone directly stimulates erythropoiesis, making hematocrit rise the most common TRT-related safety concern — elevated levels increase blood viscosity and clotting risk.
Hematocrit above 52–54% is associated with increased risk of venous thromboembolism and stroke; TRT dose reduction, switching to a shorter ester, or therapeutic phlebotomy is typically required.
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Analyze My Bloodwork →GearCheck provides blood marker analysis and harm reduction education. Information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional.