RT Journal Article SR Electronic T1 An improved method for the measurement of red cell survival using non-radioactive chromium. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 655 OP 659 DO 10.1136/jcp.32.7.655 VO 32 IS 7 A1 Drysdale, H C A1 Emerson, P M A1 Holmes, A YR 1979 UL http://jcp.bmj.com/content/32/7/655.abstract AB An improved technique for the measurement of red cell survival is described in which non-radioactive 50Cr is used in patients for whom radioactive labels are not advisable. The 50Cr was measured by neutron activation analysis using a high resolution germanium (lithium) diode gamma-ray spectrometer. In adult controls, the values obtained were in the range accepted as normal for the 51Cr method, and double labelling experiments showed close agreement. The application of this technique to the measurement of red cell survival in pregnant women suspected of having haemolytic anemia is described.