FT3 (Trilodothyronine- Free)

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FT3 measures the level of free triiodothyronine hormone in blood to evaluate thyroid function and metabolic activity.

₹149.00 ~~₹300.00~~

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Test Details

Also Known As

Free T3 Test, FT3 Assay, Free Triiodothyronine Test, Serum FT3, Thyroid T3 Free Test

Sample Type

Blood

Gender

Male, Female

Age Group

Adolescents to elderly (as advised by physician)

Pathology

Test Code

Free Triiodothyronine (FT3) is the unbound, biologically active form of the thyroid hormone T3. It plays a vital role in regulating metabolism, heart rate, body temperature, and energy production. Unlike total T3, FT3 reflects the hormone that is readily available for use by the body, making it a more accurate indicator of thyroid status.

The FT3 test is primarily used to diagnose and monitor hyperthyroidism, assess borderline thyroid dysfunction, and evaluate patients with abnormal TSH or FT4 levels. It is also helpful in detecting T3-toxicosis and monitoring treatment response in thyroid disorders. FT3 is usually interpreted alongside TSH and FT4 for comprehensive thyroid assessment.

Recommended Tests

Frequently Asked Questions

It is used to assess thyroid function, especially in suspected hyperthyroidism.

FT3 measures only the active, unbound hormone, while total T3 includes both bound and free forms.

Fasting is usually not required unless combined with other tests.

High FT3 levels may suggest hyperthyroidism or T3-toxicosis.

Low levels may be seen in hypothyroidism or severe illness.

It is commonly tested along with TSH and FT4 for accurate diagnosis.

FT3 (Trilodothyronine- Free)