A Thyroid Function Test (TFT) is a common blood test that checks how well your thyroid is working. The thyroid is a small gland in the neck that regulates metabolism, energy levels, and overall well-being. The key components measured in a TFT are:
- Thyroid-Stimulating Hormone (TSH):
- TSH is produced by the pituitary gland and controls how much thyroid hormone the thyroid should release. Elevated TSH levels typically suggest hypothyroidism (an underactive thyroid), while low TSH levels indicate hyperthyroidism (an overactive thyroid).
- Free or Total Thyroxine (T4):
- T4 is one of the two major hormones produced by the thyroid. It is converted into the active form, T3, in the body. Low T4 levels can indicate hypothyroidism, while high levels suggest hyperthyroidism.
- Free or Total Triiodothyronine (T3):
- T3 is the more active thyroid hormone. It helps regulate body temperature, metabolism, and energy. Abnormal T3 levels, especially elevated T3, are common in hyperthyroidism.
What to Expect During the Test:
- The test is a standard blood draw, usually from a vein in your arm.
- It takes only a few minutes, and you can resume normal activities afterward.
How to Interpret Results:
- High TSH with low T3/T4 usually means hypothyroidism.
- Low TSH with high T3/T4 suggests hyperthyroidism.
- Normal TSH with abnormal T3 or T4 may require further investigation to assess thyroid health.
c) Recommended Tests
- Total Thyroxine (T4):
Measures the level of thyroxine, a critical hormone for metabolism regulation. This test is essential for diagnosing thyroid function disorders.
Total Thyroxine (T4) - Total Triiodothyronine (T3):
Evaluates the active form of thyroid hormone, important for detecting hyperthyroidism or thyroid imbalances.
Total Triiodothyronine (T3)
