TSH, Free T3 & Free T4 Blood Test
TSH, Free T3 & Free T4 (LabCorp)
This package includes TSH, Free T3 and Free T4, 3 common tests for measuring Thyroid Function. The thyroid is a small butterfly-shaped gland which produces hormones that regulate a number of vital bodily functions. The thyroid controls your metabolism, heart rate, body temperature, digestive system, muscular system and cell production. The two main hormones produced by the thyroid are Thyroxine (T4) and Triiodothyronine (T3). Hormone production is determined by the level of Thyroid Stimulating Hormone (TSH) which is produced by the pituitary gland.
Free T3 and Free T4 are the portions of the hormones which are not bound to proteins and thus available for the body to use. Measuring the unbound levels of T3 and T4 can be more accurate for some people than measuring Total T3 and T4.
Customers who are looking for a more comprehensive thyroid testing package which includes additional measurements may wish to order the Thyroid Comprehensive Panel with Free or the Thyroid Comprehensive Panel with Reverse and Free.
Turnaround time for this package is typically 1 business day.
Where can I find a TSH, Free T3 & Free T4 test near me?
Check our lab finder to locate a collection site in your area.
Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
It is recommended that someone taking Biotin (also known as vitamin B7 or B8, vitamin H, or coenzyme R) stop consumption at least 72 hours prior to the collection of a sample.
Specimen collection after fluorescein dye angiography should be delayed for at least 3 days. For people on hemodialysis, specimen collection should be delayed for 2 weeks.
The collection should not occur during or after administration of heparin.
This package includes:
TSH Thyroid-Stimulating Hormone, Third-generation TSH
T4 Free, Direct Free T4, T4 Free, Free Thyroxine, Thyroxine (T4), Free, Direct
T3 Free Free T3, Triiodothyronine (T3), Free