RT Journal Article SR Electronic T1 Advantages of Multiple Sampling in Red Blood Cell Volume Determinations JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 83 OP 84 VO 4 IS 2 A1 Kasecamp, Wayne R. A1 Longo, Rosemary A. YR 1976 UL http://tech.snmjournals.org/content/4/2/83.abstract AB A patient with an elevated hematocrit was referred to the clinical nuclear medicine laboratory for evaluation of possible polycythemia. A 51Cr red blood cell mass measurement was performed. Multiple postinjection samples proved to be necessary for precise determination of the red blood cell mass by the 51Cr radioisotope dilution technique.