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Four sensitive thyrotropin assays critically evaluated and compared.

D S Sgoutas1, E G Barton, M Hammarstrom

  • 1Department of Pathology, Emory University, Atlanta, GA 30322.

Clinical Chemistry
|August 1, 1989
PubMed
Summary
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Four sensitive thyroid-stimulating hormone (TSH) assays were compared for clinical utility. Magic-Lite, Delfia, and Allegro showed higher accuracy in distinguishing hyperthyroid from euthyroid patients compared to Stratus.

Area of Science:

  • Endocrinology
  • Clinical Chemistry
  • Assay Development

Background:

  • Thyroid-stimulating hormone (TSH) is a key biomarker for thyroid function assessment.
  • Accurate TSH measurement is crucial for diagnosing and managing thyroid disorders like hyperthyroidism and hypothyroidism.
  • Several sensitive TSH assay procedures are available, necessitating comparative performance evaluations.

Purpose of the Study:

  • To compare the analytical and clinical performance of four sensitive TSH assay procedures.
  • To evaluate the ability of these assays to discriminate TSH concentrations across different thyroid states (euthyroidism, hyperthyroidism, hypothyroidism).
  • To identify potential differences in assay performance, particularly in complex patient populations.

Main Methods:

  • Comparison of four sensitive TSH assay procedures: Corning's Magic-Lite, ElectroNucleonics' Delfia, Baxter's Stratus, and Nichols' Allegro.

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  • Evaluation of analytical performance based on assay variation and sensitivity criteria (interassay CV ≤ 10-15%).
  • Assessment of clinical performance by comparing TSH concentrations in sera from euthyroid, hyperthyroid, and hypothyroid individuals.

    • Main Results:

    • All four TSH assays met analytical criteria for sensitivity and assay variation.
    • All procedures accurately distinguished hypothyroid from euthyroid subjects.
    • Magic-Lite, Delfia, and Allegro demonstrated 97% accuracy in differentiating hyperthyroid from euthyroid states, while Stratus achieved 90% accuracy.
    • Performance differences were more pronounced in patients on suppressive thyroid hormone therapy and in hospitalized nonthyroidally ill patients, potentially due to serum matrix effects.

    Conclusions:

    • Three of the four TSH assay procedures (Magic-Lite, Delfia, Allegro) offer superior accuracy in distinguishing hyperthyroidism from euthyroidism compared to the Stratus assay.
    • Serum matrix effects may influence TSH assay performance, particularly in hospitalized patients.
    • The choice of TSH assay may impact diagnostic accuracy, especially in specific clinical scenarios.