Abstract
Abstract Two commercial isotopic methods for measuring serum thyroxine—radioimmunoassay and competitive protein binding analysis—have been compared with regard to recovery of thyroxine added to sera, within-run and run-to-run reproducibility, and results for patients’ sera. For the latter the relationship is expressed by the equation CPBA = 082 RIA + 0.33. The correlation coefficient was 0.92.
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