The provider performs a study to measure the patient’s whole blood volume, including red blood cell and plasma volumes. The test involves injecting the patient with a radiopharmaceutical or radiotracer and his own red blood cells that have been tagged with a tracer. The provider then calculates the volumes using an isotope dilution principle. It determines the volume of these items by introducing a known quantity of radiopharmaceuticals into an unknown volume of blood and measuring the concentration after adequate mixing.
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