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Clinical Chemistry 28: 119-121, 1982;
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Clinical Chemistry, Vol 28, 119-121, Copyright © 1982 by American Association for Clinical Chemistry

Evaluation of a commercially available radioimmunoassay kit for measurement of doxorubicin in plasma

E Piall, GW Aherne and V Marks

We evaluated a commercially available (Diagnostic Biochemistry Inc.) doxorubicin 125I radioimmunoassay kit. This kit gave a high apparent doxorubicin concentration (greater than 12 micrograms/L), which was not linearly related to dilution, for two pools of normal human serum and plasma and also for samples collected from patients before they received the drug. In contrast, a doxorubicin 3H radioimmunoassay developed by us gave a low blank (2 micrograms/L), which was linearly related to dilution, for the same pools and patients' samples. Doxorubicin concentrations in the plasma of patients receiving the drug were compared by the two methods; the kit gave results five- to 10-fold those obtained with our assay. High nonspecific interference by serum and plasma as measured by the 125I radioimmunoassay must therefore be borne in mind by users of the kit, and we suggest that results should be corrected for these nonspecific effects.




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Copyright © 1982 by the American Association for Clinical Chemistry.