Quote Originally Posted by jim230027 View Post
It's nota guarantee brother I am telling you from personal experience that a whole blood donation one time may not lower it. If it did for you great but I have donated before and had my hematocrit level not budge.
I take that back, I am wrong. After reading a little on it I found that the hematocrit formula is 1% hematocrit=1ml of RBC/100ml of blood. So it is directly proportional and lower the volume of blood does not guarantee altering the proportion of RBC in the blood. Hope that clears things up for you too OP, you learn something new every day.