Test Catalog

Test ID: FRT3    
T3 (Triiodothyronine), Free, Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Free triiodothyronine (T3) is a second- or third-level test of thyroid function; it provides further confirmation of hyperthyroidism, supplementing the tetraiodothyronine (T4), sensitive thyrotropin (sTSH), and total T3 assays


Evaluating clinically euthyroid patients who have an altered distribution of binding proteins


Monitoring thyroid hormone replacement therapy

Method Name A short description of the method used to perform the test

Immunoenzymatic Assay

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

T3 (Triiodothyronine), Free, S

Aliases Lists additional common names for a test, as an aid in searching

Free T3 (Triiodothyronine)
FT3 (Free Triiodothyronine)
T3 (Triiodothyronine), Free, Serum
Triiodothyronine, Free
Free T3 Only, Serum