Blood donation every 8 weeks on TRT, is it actually controlling your hematocrit or just moving it up and down?

[Beantown Rick]

Three years on TRT, donating blood every 8 weeks. My hematocrit sits around 52-53% before donation and drops to 47-48% after. Then climbs back up by week 7. So technically in range but barely, and only because of the donations. My doctor sees anything above 52 and wants to reduce my dose. But my platelet count and other clotting factors are fine. Is this secondary erythrocytosis with real clot risk or just a number my doc is managing conservatively? And the hydration angle - how much does testing dehydrated actually skew the reading?

[Jock]

Secondary erythrocytosis from TRT is not polycythemia. Your GP sees 53% and panics. The relevant question is whether platelets and other clotting factors are also elevated. If they are not, the clot risk is not what the number suggests. Hydration is a significant variable - I have seen members drop 3-4 percentage points with proper hydration before the draw. Test when well-hydrated and the number often tells a different story. That said, 53% before donation and 47% after is a narrow range to be operating in. Worth discussing therapeutic phlebotomy if donations are not giving enough headroom.

[BERLINER]

The altitude variable for hematocrit interpretation is relevant and rarely discussed. At high altitude the body adapts by producing more red blood cells as a normal physiological response. A hematocrit of 52% in Denver has a different clinical significance than 52% at sea level. Any member living at altitude needs to establish their own natural baseline and track the change from that baseline when assessing TRT impact on hematocrit. Comparing against sea-level laboratory reference ranges leads to incorrect conclusions.

[NYCgains]

The hydration point is huge and consistently underappreciated. I tested this on myself - same week, one draw dehydrated on a Monday morning, one draw well-hydrated Thursday afternoon. Three percentage point difference in hematocrit. That can turn a borderline result into a problem result. Always hydrate before testing. The EQ hematocrit issue is also real - anyone adding EQ to a TRT base needs to know their donation schedule needs to tighten up significantly.

[Chi Guy]

Been donating every 8 weeks for 6 years on TRT. Hematocrit cycles between 48 and 54. The key point about secondary erythrocytosis versus polycythemia vera is one most doctors miss entirely. Platelet count is the number that matters alongside hematocrit for actual clot risk assessment. My GP was ready to cut my TRT dose when hematocrit hit 52. Full clotting panel showed everything else normal. Kept the dose, kept the donations, no issues. Get the full panel before accepting a dose reduction based on hematocrit alone.

[FrankfurtFit]

Secondary erythrocytosis versus polycythemia vera is the clinical distinction that changes the management approach entirely. Most general practitioners are not familiar with this differentiation in the context of TRT. A haematologist consultation is worth pursuing if your GP is pushing for dose reduction based on hematocrit alone. A full clotting factor panel is what the decision should be based on. The hydration variable affecting the result is real and significant - I recommend always testing in the morning after 500ml of water minimum.

[CaliBro]

Dutasteride disqualified me from Red Cross donation last year. Had to sort out therapeutic phlebotomy through my GP which took 3 weeks to arrange. Anyone on dutasteride for hair or prostate needs to know this before their hematocrit starts climbing and they show up at the donation centre. Plasma donation has different eligibility criteria and may be an option but worth confirming for your location. Plan the alternative before you need it.