Indications : The test measures the patient's total circulating volume of blood and/or fractions of the blood volume.
Physiology : A component of the blood (e.g., Albumin) is labeled using a radioisotope. The dilution of the label is inversely proportional to the size (Volume) of the compartment in which it has been diluted.
Interpretation : This test differentiates relative from absolute polycythemia. Polycythemia is increased red cells and is opposite to anemia. Polycythemia is usually considered when hemoglobin is 18g/dL, hematocrit is 52% and RBC count is 6 million/mm3.
Test Results : Dilution Technique using 125I – tagged albumin and/or 51Cr-tagged Red Blood Cells.
Related Tests : Erythropoietin Test, Hematocrit Test, Peripheral Blood, Red Cell Mass.
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