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[Thyroglobulin assay ambiguities]

R Sapin1, J L Schlienger

  • 1Laboratoire universitaire de biophysique, URA CNRS 1173, Faculté de Médecine, Strasbourg.

Annales De Biologie Clinique
|October 1, 1998
PubMed
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Thyroglobulin immunometric assays show significant variability due to lack of standardized reference material and interference from autoantibodies. Results require careful interpretation considering autoantibody presence for accurate clinical assessment.

Area of Science:

  • Clinical Chemistry
  • Immunoassay Technology
  • Endocrinology

Background:

  • Immunometric assays (IMA) for thyroglobulin have largely replaced radioimmunoassays but present persistent challenges.
  • Lack of widespread use of human thyroglobulin reference material (CRM 457) contributes to significant inter-kit variability in results.

Purpose of the Study:

  • To highlight the limitations and potential interferences in current thyroglobulin immunometric assays.
  • To emphasize the need for improved standardization and interpretation of thyroglobulin measurements.

Main Methods:

  • Discussion of common issues in IMA, including the high-dose hook effect and interference from thyroglobulin autoantibodies.
  • Evaluation of the limitations of the recovery test for detecting autoantibody interference.

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Main Results:

  • The high-dose hook effect can falsely lower thyroglobulin levels in high-concentration samples.
  • Autoantibody interference, though reduced by antibody selection, persists and is not reliably detected by standard recovery tests.
  • Thyroglobulin levels are lower in Graves' disease patients with autoantibodies, even with normal recovery tests.

Conclusions:

  • Thyroglobulin assay results must be interpreted considering the presence or absence of autoantibodies.
  • Development of assays measuring total thyroglobulin (free and autoantibody-bound) is needed to improve performance evaluation.