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Related Experiment Videos

Two sensitive immunometric assays for serum thyroid stimulating hormone evaluated

C Papadea1, N A Papadea, J C Cate

  • 1Department of Pathology and Laboratory Medicine, College of Dental Medicine, Medical University of South Carolina, Charleston 29425, USA.

Annals of Clinical and Laboratory Science
|April 29, 1998
PubMed
Summary

Two new thyroid stimulating hormone (TSH) assays meet performance standards but show non-transferable results between methods. Laboratories must validate chosen TSH assays for accurate patient care.

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Area of Science:

  • Clinical Chemistry
  • Immunoassay Technology

Background:

  • Thyroid stimulating hormone (TSH) is a key biomarker for thyroid function.
  • Third-generation immunometric assays offer improved sensitivity for TSH measurement.

Purpose of the Study:

  • To evaluate the analytical performance of two new commercial third-generation TSH assays.
  • To compare their functional sensitivity, reproducibility, parallelism, and accuracy against an established method.

Main Methods:

  • Assessed functional sensitivity, reproducibility, and parallelism for both automated and manual TSH assays.
  • Conducted method comparison studies using 86 patient samples against a reference third-generation assay.

Main Results:

  • Both new TSH assays achieved third-generation functional sensitivity criteria.

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  • Assays demonstrated good reproducibility (CVs < 11%) and parallelism.
  • While highly correlated (R > 0.95), regression slopes indicated non-transferable patient sample results between methods.

    • Conclusions:

    • New third-generation TSH assays demonstrate acceptable analytical performance.
    • Significant differences in results necessitate method-specific validation for clinical laboratories.
    • Careful validation is crucial to ensure reliable TSH measurements for patient care.