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Clinical Chemistry 32: 1378-1382, 1986;
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Clinical Chemistry, Vol 32, 1378-1382, Copyright © 1986 by American Association for Clinical Chemistry

An optimized method for measuring cyclosporin A with 125I-labeled cyclosporin

RA Felder, TE Mifflin and B Bastani

We evaluated the use of the new iodinated ligand for the in vitro measurement of cyclosporin A by radioimmunoassay (RIA). Substitution of the iodinated cyclosporin (125I-CyA) for the corresponding tritium- labeled analog (3H-CyA) considerably simplifies and accelerates the currently available RIA, and improves its precision. Analysis of the respective dose-response curves showed that the 50% B0 value was lower for the 125I-CyA assay than for the 3H-CyA assay (37 vs 77 micrograms/L). Use of whole-blood specimens minimized interferences from temperature and hematocrit. We conclude that the use of 125I-CyA in a commercially available RIA for whole-blood specimens is accessible to most laboratories and provides rapid, reproducible data for management of transplant patients.




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Copyright © 1986 by the American Association for Clinical Chemistry.