Unit Code 600915:
T3 (Triiodothyronine), Free and Total, Serum
Useful For
T3 is a second-order test in follow-up to low TSH values in the
evaluation of patients suspected of having hyperthyroidism caused
by excess T3 (T3 toxicosis).
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 T4, sensitive thyrotropin, and total T3 assays.
Profile Information
| Unit Code | Reporting Name | Available Separately | Always Performed |
| 200177 | T3 (Triiodothyronine), Free, S | Yes | Yes |
| 200150 | T3 (Triiodothyronine), Total, S | Yes | Yes |
Method Name
Immunoenzymatic Assay
Reporting Name
T3 (Triiodothyronine), Fr Tot, S
Ordering Mnemonic
FT3PL/NE
NE/FT3PL
Aliases
Free & Total T3, Serum Performed at Mayo New England</st1:count
FT3 and TT3 Performed at Mayo New Engla
T3, Free & Total, Serum Performed at Mayo New England
Total & Free T3, Serum Performed at Mayo New England
External
link
PDF
document
Excel
document
Word
document