Test ID: FRT3
T3 (Triiodothyronine), Free, Serum
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
9404
NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.
Yes
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
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
T3 (Triiodothyronine), Free, S
Aliases Lists additional common names for a test, as an aid in searching
Free T3 (Triiodothyronine)
Free T3 Only, S
FT3 (Free Triiodothyronine)
T3 (Triiodothyronine), Free, Serum
Triiodothyronine, Free
Free T3 Only, S
FT3 (Free Triiodothyronine)
T3 (Triiodothyronine), Free, Serum
Triiodothyronine, Free
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