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atir (@atir)

Polycythemia Vera

Blood Cancers & Disorders | Last Active: Aug 6, 2020 | Replies (39)

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As a follow up to my question, I searched for diagnostic criteria for PV (since they kept emphasizing that DIAGNOSTIC criteria is a hematocrit over 32." They kept using "32" as some magical number. I know that internet resources aren't always accurate, but EVERY paper I have found in the peer-reviewed literature states that one of the major diagnostic criteria for PV is: "Hemoglobin >16.5 g/dL in men and >16 g/dL in women, or hematocrit >49% in men and >48% in women, or red cell mass >25% above mean normal predicted value" (reminder, my hemoglobin today was 10.7, and hematocrit 33, my red cell mass has never been studied." So, where did this magical number of 32 come from? And, does it make sense considering that value would make me anemic (not polycythemic)? Not sure if this is the case, but OLD criteria (from 1970 group), included as one of the major diagnostic criteria as "Category A criteria are as follows: Total red blood cell mass ≥36 mL/kg in males or ≥32 mL/kg in females" I'm wondering if I was literally just diagnosed with PV based on the WRONG measurement (as I have never had red cell mass measured), from an old set of criteria. This would explain the PV diagnosis, which is seemingly contradictory with my (albeit slightly) anemic hemoglobin/hematocrit. Any thoughts on this explanation, or, just in general about if/ow a definitive diagnosis of PV can be made based on just the JAK2 mutation and LOW RBCs?

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Replies to "As a follow up to my question, I searched for diagnostic criteria for PV (since they..."

@apr931 Hi there! I wanted to chime in on your question regarding the number 32. I have no idea where that came from. As of your post that I am responding to, where your hemoglobin was 10.7 and hematocrit 33, both of those results are below normal. For a man and for a woman. Polycythemia vera diagnostic criteria includes one of which that is a highly elevated hemoglobin and hematocrit. Which you do not have. However, another diagnostic criteria for PV is the JAK2 mutation. I'm guessing your PV diagnosis was based solely on the JAK2 mutation, which would be inaccurate according to your hemoglobin & hematocrit levels. Throughout my extensive research into PV and myeloproliferative disorders in general, your particular results seem to point more towards essential thrombocythemia (ET), or primary myelofibrosis (PMF). Your low hemoglobin and hematocrit point away from PV. The diagnostic criteria for PV was recently-ish revised in 2016, and still your low hemoglobin/hematocrit levels point away from PV. Bless you & fight the good fight! Just trying to provide some (hopefully) helpful information. 🙂