How Much Does Hemoglobin and Hematocrit Lower After Donating Blood?

So, I’ve been dealing with sinus infections and a deviated septum. I recently had surgery to correct my deviated septum. Anyway, my Hemoglobin is 15 and my Hermatocrit is 44. Obviously these are on the high end and could cause problems when upping T levels. I also read a study related to sleep apnea. In the study it was stated that the worse the sleep apnea is, the higher the Hermatocrit and Hemoglobin levels. I have mild sleep apnea(I use a mouth appliance), but again it was worsened since I kept getting sinus infections. My other question would be, can your Hermatocrit and Hemoglobin lower by themselves once your breathing and health improve, or do you still have to donate blood to get to a new baseline level?

These are not high at all! Hematocrit is low for a male.

Agreed. Normal hematocrit in men is 45%. Normal hemoglobin is 15.5 g/dl. I don’t know the answers to your other questions.