See below: There is more than one factor that needs to be taken into consideration. High hemoglobin, low erthyropoietin and JACK 2 all need to be looked at. You may consult this site for more information on this topic. http://www.mayoclinic.org/diseases-conditions/polycythemia-vera/basics/definition/con-20031013
Answered 7/27/2016
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