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Clinical Chemistry 38: 1654-1657, 1992;
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Clinical Chemistry, Vol 38, 1654-1657, Copyright © 1992 by American Association for Clinical Chemistry

First practical colorimetric assay of lithium in serum

E Chapoteau, BP Czech, W Zazulak and A Kumar
Miles Incorporated, Tarrytown, NY 10591.

We report a colorimetric method for determining lithium in blood serum without sample pretreatment or solvent-extraction steps. The method is based on a novel chromogenic ionophore that exhibits exceptionally high selectivity (much greater than 4000:1) for lithium over sodium. The standard curve for the method is linear up to 3.5 mmol/L and exceeds the therapeutic range for lithium. The results for 57 patients' samples correlated well with results obtained with an Instrumentation Laboratory flame photometer (r = 0.97).




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Copyright © 1992 by the American Association for Clinical Chemistry.