I have been on TRT for over ten years and my lab values always hover around 56 Hct and 19 Hgb. I never paid much attention to it but now that I am mid 40s I am starting to worry more about those things. As far as I can tell, I have never had any ill effects from those levels. There seems to be a broad consensus to stay closer to the normal range but when I looked at a study of people living at high altitude, their normal range was 45 to 61%. (Normal hematological values for healthy persons living at 4000 meters in Bolivia. - PubMed - NCBI) I also heard that for people living at higher altitude in the US, some doctors consider 55% Hct normal, no treatment required.
But just because the body is able to adapt, does not mean that it's a good idea. So then I looked whether there are long term negative consequences associated with adaptation to high altitudes but, if anything, the opposite seems to be the case: no negative effects and some protective effects on coronary heart disease and stroke mortality. (Lower mortality from coronary heart disease and stroke at higher altitudes in Switzerland. - PubMed - NCBI)
I also read that starting around 60% Hct, blood viscosity increases exponentially which interestingly is the same as the upper limit of normal in high altitude adjusted individuals. But what about the 51% - 60% range. It's definitely not "normal" but does it require intervention?
But just because the body is able to adapt, does not mean that it's a good idea. So then I looked whether there are long term negative consequences associated with adaptation to high altitudes but, if anything, the opposite seems to be the case: no negative effects and some protective effects on coronary heart disease and stroke mortality. (Lower mortality from coronary heart disease and stroke at higher altitudes in Switzerland. - PubMed - NCBI)
I also read that starting around 60% Hct, blood viscosity increases exponentially which interestingly is the same as the upper limit of normal in high altitude adjusted individuals. But what about the 51% - 60% range. It's definitely not "normal" but does it require intervention?