T3 (Triiodothyronine), Free and Total, Serum
NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.
Triiodothyronine (T3) is a second-order test in follow-up to low thyroid stimulating hormone values in the evaluation of patients suspected of having hyperthyroidism caused by excess T3 (T3 toxicosis).
Free T3 (FT3) levels can be helpful in evaluating patients with altered levels of binding proteins, such as pregnant patients, patients receiving estrogens and anabolic steroids, and patients with dysalbuminemia. Some investigators recommend FT3 for monitoring thyroid replacement therapy, although its clinical role is not precisely defined. FT3 also provides a further confirmatory test for hyperthyroidism to supplement the thyroxine (T4), sensitive thyrotropin, and total T3 assays.
Profile Information A profile is a group of laboratory tests that are ordered and performed together under a single Mayo Test ID. Profile information lists the test performed, inclusive of the test fee, when a profile is ordered and includes reporting names and individual availability.
|Test ID||Reporting Name||Available Separately||Always Performed|
|FRT3||T3 (Triiodothyronine), Free, S||Yes||Yes|
|T3||T3 (Triiodothyronine), Total, S||Yes||Yes|
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
FT3 and TT3
T3, Free & Total, Serum
Total & Free T3, Serum