If you read medical papers specific to this effect testosterone has on blood thickness you’ll see that testosterone compensates for this by increasing nitric oxide production and dilating blood vessels.
Also hct is nothing more then a percentage.of Rbc x MCV
Donating blood is a catch 22. After donating your body will ramp up and produce red blood cells at a way faster rate. And you’re back to square one. Also you’re tanking your ferritin.
