A member asked:

How is polycythemia rubra vera differentiated from polycythemia associated with stress? rbc only elevated once in life. hgb/hct elevated often.

A doctor has provided 1 answer

Stress?: Stress doesn't cause polycythemia. Being dehydrated is a common cause. If your Hgb/Hct is only slightly elevated, stop worrying -- reference ranges are set so that several percent of healthy folks fall outside. If it's well above, consider a workup for the causes, including a variant hemoglobin and a subtle right-to-left shunt.

Answered 10/8/2018

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