Abstract
ObjectivesWe emphasize the importance of routine follow-up of subnormal TSH concentrations with QC materials. Design and methodsThe functional sensitivity (FS) of the ADVIA Centaur® system TSH assay was assessed. We report the values yielded for QC materials in two clinical laboratories. ResultsThe FS was <0.02mIU/L. The low-TSH QC (a serum pool) showed unacceptable between-lot imprecision (mean 0.0252mIU/L, CV 22%). ConclusionWe do encourage healthcare laboratories to constitute low-TSH serum pools to ensure that the results they report meet 3rd-generation criteria.
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