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DOI: 10.1177/107155769700400506 Red Cell Volume Determination Using a Stable Isotope of Chromium
Departments of Obstetrics and Gynecology and Pediatrics, Brown University, Women and Infants' Hospital of Rhode Island, Providence, Rhode Island; Human Nutrition Research Center, U.S. Department of Agriculture, Beltsville, Maryland Objective: To validate and improve a method of red cell volume determination by useof a stable isotope of chromium. Methods: Twelve subjects were sequentially injected with red blood cells labeled with a stable isotope of chromium (53 Cr) and red blood cells labeled with radioisotopic chromium (51 Cr). Measurement of 53Cr dilution was by gas chromatography/mass spectrometry. Measurement of 51Cr dilution was by gamma counter. Results: Comparison of the two methods let to results that differed on average by 34.5 ± 45.0 mL (1.8 ± 2.2%), 0.3 to 3.2%, 95% confidence interval. Conclusion: Measurement of red cell volume by use of a stable isotope of chromium is accurate, with potential applications including measurement in pregnant women and children or other groups in whom exposure to radioisotopes is undesirable.
Key Words: Red cell volume chromium stable isotopes blood volume
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