@simple27 — Agree that my anemic hematocrit points AWAY from PV. I wish I could convince my oncologist of how ridiculous this diagnosis is. Almost like saying "you are obese because you weigh 80 pounds." I suppose it is POSSIBLE to have masked polycythmia vera, but that's usually only true if there is substantial, consistent bleeding. But, in any case you cannot DIAGNOSE PV BASED on a low hematocrit– it makes no sense.
My EPO levels also point away from PV, as they are high. So, yes, my brilliant oncologist diagnosed me with PV based solely on the JAK mutation, while I am the OPPOSITE of two of the other criteria, and have never had a bone marrow biopsy.