This blood test measures the level of one of the hormones made by the thyroid gland, total thyroxine (T4).
This blood test measures the level of total thyroxine, or T4. T4 is one of the hormones made by the thyroid gland. It is often done along with a thyroid-stimulating hormone (TSH) and triiodothyronine (T3) test to see how well your thyroid gland is working.
In an adult, the blood sample is taken by placing a needle in a vein in the arm. In a newborn, the sample is taken by pricking the baby's heel.
This care path's costs do not include the charge to draw blood from a vein (venipuncture). There will only be one charge to draw blood, even if multiple tests are being performed on the samples that are taken.
What should I ask my healthcare provider before having this test?
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