Spurious vs real: Need good history. Decrease plasma volume or stress erythrocytosis would be spurious. Secondary causes could include anything associated with tissue hypoxia ex. Chronic pulmonary disease. Normal arterial po2 could mean increase carboxyhemoglobinemia 2nd to cigarette smoking. Inappropriate increase ex renal disorders;ex renal cyst or ca. Primary cause; p. Vera bone marrow disorder. Few examples.
Answered 5/15/2020
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