Felis ISSN 2398-2950

Endocrinology: tri-iodothyronine (T3)

Synonym(s): T3

Contributor(s): David Bruyette, Carmel Mooney, Mark Peterson

Overview

  • T3 comprizes approximately 3% circulating thyroid hormone.
  • It is derived from T4 Thyroxine assay by deiodinization.
  • Approximately 60% of conversion of T4 to T3 occurs in extrathyroidal tissue.
  • T3 is more active than T4 within a cell.

Sampling

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Tests

Methodologies

  • Radioimmunoassay.

Availability

  • Most commercial laboratories can do test - few recommend it.

Validity

Sensitivity

  • Poor as only 70% of hyperthyroid cases have elevated [T3].

Specificity

  • Good since cats without hyperthyroidism do not have elevated [T3].

Technician (extrinsic) limitations

  • Minimal.

Result Data

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Further Reading

Publications

Referred papers

Other sources of information

  • Most commercial laboratories.


ADDED