A single measurement with (51)Cr-tagged red cells or (125)I-labeled human serum albumin in the prediction of fractional and whole blood volumes: an assessment of the limitations.

This study investigated variations in the prediction of blood volumes from a single measurement of red cell volume (RCV) with (51)Cr or plasma volume (PV) with (125)I human serum albumin (HSA). In 111 subjects, fractional and whole blood volumes were estimated from separate direct measurements of RCV and PV. The f ratio (body to venous hematocrit) was also determined.