Low oxygen tension ie high altitudes

■ impaired oxygen-carrying capacity of hemoglobin

(1.2) Due to decreased blood flow—congestive heart failure

(2) Unrelated to inadequate oxygen delivery and need, and associated with benign or malignant lesions of the following:

■ kidney—cysts, hydronephrosis, adenoma, hyper-nephroma

■ cerebellum—hemangioblastoma

■ liver—hepatoma, hamartoma

■ other—adrenal (pheochromocytoma), lung

Familial polycythemias (normal hemoglobin function) Primary polycythemia (polycythemia vera)

Table 47.2 Relation of absolute erthrocytosis (AE) to

hematocrit (Hct)10

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