Question: who criteria for polycythemia vera?
Answer: Diagnosis requires the presence of either all three major criteria or the first two major criteria and the minor criterion. Major WHO criteria are as follows: 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.