I've was diagnosed with PV about 3 years ago and have gone through many tests including a couple of sessions at Guys hospital. All tests were inconclusive and although its difficult to prove diagnosis is for secondary PV although I have had many of the symptoms off and on since childhood.
Regardless of cause what I am interested in finding out is at what level does your hospital recommend you have venesection. I think the blood level is different in men to women so prefer feedback from women. The internet says "the normal hematocrit for men is 40 to 54%; for women it is 36 to 48%" but what I want to know if at what level does your consultant recommend venesection as treatment.