In recent years several OECD test guidelines have been updated and some will be updated shortly with the requirement to measure thyroid hormone levels in the blood of mammalian laboratory species. There is, however, an imperative need for clarification and guidance regarding the collection, assessment, and interpretation of thyroid hormone data for regulatory toxicology and risk assessment. Clarification and guidance is needed for 1) timing and methods of blood collection, 2) standardization and validation of the analytical methods, 3) triggers for additional measurements, 4) the need for T4 measurements in postnatal day (PND) 4 pups, and 5) the interpretation of changes in thyroid hormone levels regarding adversity. Discussions on these topics have already been initiated, and involve expert scientists from a number of international multisector organizations. This paper provides an overview of existing issues, current activities and recommendations for moving forward.

Original languageEnglish
Pages (from-to)126-130
Number of pages5
JournalReproductigve Toxicoloy
Publication statusPublished - Sept 2018


  • Animals
  • Clinical Laboratory Techniques/methods
  • Endocrine Disruptors/toxicity
  • Female
  • Guidelines as Topic/standards
  • Male
  • Reference Standards
  • Reproduction/drug effects
  • Thyroid Function Tests
  • Thyroid Gland/drug effects
  • Thyroid Hormones/blood
  • Toxicity Tests/methods


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