Canis ISSN: 2398-2942

Tri-iodothyronine (T3) assay

Synonym(s): T3

Contributor(s): David Bruyette

Overview

  • T3 comprises approximately 3% circulating thyroid hormone.
  • It is derived from T4 by de-iodination.
  • Conversion of T4 to T3 mostly an intracellular process.
  • T3 is more active than T4 within a cell.

Sampling

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Tests

Methodologies

  • Radioimmunoassay.

Availability

  • Most commercial laboratories can do test - none recommend it.

Validity

Sensitivity

  • Very poor.

Specificity

  • Very poor.

Predictive value

  • Low.

Technique (intrinsic) limitations

  • Anti-T3 antibodies will falsely increase values.

Result Data

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Further Reading

Publications

Refereed papers


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