some peeps have symptoms and some none. some get symptoms the moment they go over 50% hct and this is not strange.
go by symptoms, not just numbers.
symptoms can be blurred vision, difficult breathing, sleep disturbances, headaches, fuzzy and slower mentation and cognition, tinnitus.
watch out for lowering your ferritin to low with donations. also high RBC count drains the ferritin and iron depots and can give severe symptoms as well. keeping rbc's in check is a very smart thing, not just for risk of clots