An abnormally increased concentration of hemoglobin in the blood, through either reduction of plasma volume or increase in red cell numbers. It may be a primary disease of unknown cause, or a secondary condition linked to respiratory or circulatory disorder or cancer.
- The differential diagnoses included chronic hepatitis, idiopathic urticaria, uremia, polycythemia, thyroid disease, and malignancy, among others.
- This is more than twice the production rate in adults, primarily because of relative polycythemia and increased red blood cell turnover in neonates.
- Because in chronic pulmonary disease both hypoxemia and polycythemia are simultaneously present, their individual effects on the pulmonary circulation have been difficult to define.
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