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Red cell volume determination using a stable isotope of chromium
H M Silver1, M A Seebeck, R M Cowett
1Department of Obstetrics and Gynecology, Brown University, Women and Infants' Hospital of Rhode Island, Providence 02905, USA.
Objective:
To validate and improve a method of red cell volume determination by use of a stable isotope of chromium.
Methods:
Twelve subjects were sequentially injected with red blood cells labeled with a stable isotope of chromium (53Cr) and red blood cells labeled with radioisotopic chromium (51Cr). Measurement of 53Cr dilution was by gas chromatography/mass spectrometry. Measurement of 51Cr dilution was by gamma counter.
Results:
Comparison of the two methods led 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.
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