relative polycythemia


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rel·a·tive pol·y·cy·the·mi·a

a relative increase in the number of red blood cells as a result of loss of the fluid portion of the blood.

relative polycythemia

A spurious ↑ in RBCs with a normal red cell mass, and a ↓ in blood volume; RP may occur in a background of mental stress, alcohol abuse, use of diuretics, or in acute nephritis; erythropoietin–EP levels are normal–± 7 U/L in contrast to P vera, in which EP is ↓–± 2 U/L or 2º polycythemia, in which the EP is ↑–± 120 U/L. Cf Polycythemia vera.

rel·a·tive pol·y·cy·the·mi·a

(rel'ă-tiv pol'ē-sī-thē'mē-ă)
A relative increase in the number of red blood cells as a result of loss of the fluid portion of the blood.

rel·a·tive pol·y·cy·the·mi·a

(rel'ă-tiv pol'ē-sī-thē'mē-ă)
A relative increase in the number of red blood cells as a result of loss of the fluid portion of the blood.

polycythemia

an increase in the circulating red blood cell mass.
There are two distinct forms:
Primary polycythemia is a myeloproliferative disorder of unknown etiology. It occurs as an inherited defect in cattle and is a rare disease in dogs and cats. There is hyperplasia of the cell-forming tissues of the bone marrow, with resultant elevation of the erythrocyte count and hemoglobin level, and an increase in the number of leukocytes and platelets. Called also polycythemia vera.
Secondary polycythemia is a physiological condition resulting from a decreased oxygen supply to the tissues, caused by living at high altitudes, heart disease, circulatory insufficiency or severe pulmonary disease, or the production of erythropoietin or erythropoietin-like compounds, as in polycystic kidney disease, hydronephrosis or renal neoplasms.

absolute polycythemia
an increase in total hemoglobin and red cell mass with a normal plasma volume. May be a primary or secondary polycythemia.
compensatory polycythemia
a secondary polycythemia, occurring in response to impairment of oxygenation.
familial polycythemia
occurs as an autosomal recessive trait in Jersey cattle. See primary polycythemia (above).
inherited polycythemia
an inherited defect of cattle. Clinically there is dyspnea.
relative polycythemia
apparent polycythemia resulting from loss of plasma and the hemoconcentration that follows. Called also spurious polycythemia.
polycythemia vera
see primary polycythemia (above).
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