Thyroid related
Thyroperoxidase antibody (Anti-TPO)

Topic Completed: 1 March 2011

Revised: 31 December 2018, last major update March 2011

Copyright: (c) 2002-2016,, Inc.

PubMed Search: Thyroperoxidase antibody [title]

Nat Pernick, M.D.
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Cite this page: Pernick N. Thyroperoxidase antibody (Anti-TPO). website. Accessed January 21st, 2020.
Definition / general
  • Associated with Hashimoto's thyroiditis (90%) and Graves disease (75%), although also present in women with no clinical disease
  • Antibody is directed against antigen within microsomal fraction of thyroid epithelial cells
  • Methodology:
    • Previously indirect immunofluorescence microscopy with substrate of air dried human or cryostat monkey tissue, looking for cytoplasmic but not nuclear staining of thyroid follicular cells
    • Concordance between automated methods needs improvement (Clin Chim Acta 2007;376:88)
  • Does not predict relapse of Graves disease after carbimazole treatment withdrawal (Thyroid 2006;16:1041)
Differential diagnosis
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