Serum Thyroxine: Results Compared for a Commercial Radioimmunoassay and a Commercial Competitive Protein Binding Analysis

摘要

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.