A 35-year-old man is examined in an urgent care clinic.His presenting symptoms suggest polycythemia vera.The laboratory value that would confirm this possible diagnosis is an extremely:

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The symptoms of polycythemia vera are extremely high hemoglobin and hematocrit values because of the excessive production of red blood cells.Patients with polycythemia vera have 1 pint of blood taken from them until the blood values become more normal.The blood is collected as it would be for a blood donation,but it cannot be used for transfusion purposes.

A 35-Year-Old Man Is Examined in an Urgent Care Clinic