USC ENDOCRINE LABORATORIES

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TEST INDEX


Thyroglobulin (Tg) Tg Antibody TSH Free T4 Total T4 Free T3 Total T3 TPO Antibody
THBR FT4I or FT3I TBG Calcitonin PTH


FREE TRIIODOTHYRONINE (FT3)

Methodology  Electrochemiluminescence Immunoassay

Performed  Mon - Fri

Reported  Mon - Fri

Collect  One 6 mL RT (Min: 4 mL RT)

Transport  1 mL refrigerated serum (Min: 0.5 mL)

Stability  Stored at 2 - 8°C until used; Stable if frozen at - 20°C

Unacceptable  Do not use heat-inactivated samples.

Reference Range  1.9 – 5.1 pg/mL   

CPT Code  84481

Information: Triiodothyronine (T3) is the biologically active form of thyroid hormone that is responsible for the effects of thyroid hormones on the various target organs. Only a small fraction of circulating T3 is derived from the thyroid. The T3 concentration in serum thus reflects the functional status of the peripheral tissues rather than the secretory performance of the thyroid.  A reduction in the conversion of T4 to T3 results in a decrease in the T3 concentration. This occurs under the influence of drugs such as propranolol, glucocorticoids or amiodaron and in a variety of conditions associated with non-thyroidal illness (NTI).

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