🔴HEMATOCRIT

Red Blood Cell Volume & Blood Viscosity

WHAT IT MEASURES

• Percentage of blood volume occupied by red blood cells

• Oxygen-carrying capacity of the blood

• Blood viscosity and flow resistance

• Erythropoiesis activity level

• Cardiovascular strain indicator

REFERENCE RANGES

Category	Range	Status
Men (standard)	38.3–48.6%	Normal
Women (standard)	35.5–44.9%	Normal
Athletic optimal	42–48%	Optimal
TRT watch zone	48–50%	Monitor
High risk threshold	>52%	Danger
Post-phlebotomy target	<48%	Target

WHY IT MATTERS

TRT and anabolic compounds directly stimulate erythropoiesis — your body produces more red blood cells, thickening the blood. When hematocrit climbs above 52%, blood viscosity reaches dangerous levels, dramatically increasing the risk of stroke, deep vein thrombosis (DVT), and pulmonary embolism (PE). Monitor every 6–10 weeks on cycle. If elevated, increase hydration, donate blood, or schedule therapeutic phlebotomy. This is one of the most critical markers for performance athletes.

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Know Your Numbers. Own Your Performance.