The only accurate way to confirm a thyroid problem is through a blood test. This test, known as a thyroid function test, measures hormone levels in your blood.
Understanding the Thyroid Function Test
Here's what the thyroid function test looks at:
- Thyroid-Stimulating Hormone (TSH): This hormone is produced by the pituitary gland and tells the thyroid how much hormones to make.
- Thyroxine (T4): This is one of the main hormones produced by the thyroid. Doctors often check the "free" version of T4, which is called FT4.
| Hormone | Purpose |
|---|---|
| TSH | Signals the thyroid to produce hormones. |
| T4 (Thyroxine) or FT4 | The primary hormone produced by the thyroid that regulates metabolism. |
Why is This Test Necessary?
A thyroid function test is necessary to identify if your thyroid is:
- Overactive (Hyperthyroidism): The thyroid produces too much hormone.
- Underactive (Hypothyroidism): The thyroid doesn’t produce enough hormone.
What to Expect
- A blood sample is taken, usually from a vein in your arm.
- The sample is sent to a lab for analysis.
- Your doctor will review the results to determine if you have a thyroid problem.
Note: It is important to consult with a healthcare professional for accurate diagnosis and treatment.
