FT4 (Free Thyroxine)

Overview:
The FT4 test measures the level of free thyroxine in the blood. Thyroxine (T4) is a primary hormone produced by the thyroid gland, which regulates metabolism and energy production. The "free" part refers to the unbound T4 in the bloodstream, which is biologically active and available to the body.

What it detects:
This test detects the level of free T4, helping to evaluate thyroid function. Abnormal levels of FT4 can indicate thyroid conditions such as hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid), as well as other disorders affecting thyroid health.

Who should get it:
Individuals with symptoms such as fatigue, weight changes, hair loss, irregular heartbeat, or other signs of thyroid dysfunction may need this test. It is also helpful for people with known thyroid disease or those who are being monitored for thyroid treatment.

Sample required:
A blood sample is required for this test.

Fasting requirements:
Fasting is not required for this test.

Processing time:
Results available within 24-48 hours.