This test measures the blood level of a hormone made by the thyroid gland (Thyroxine, which is also known as T4).
This test measures the blood level of T4 (Thyroxine), a hormone made by the thyroid gland. It is often done along with or after a thyroid-stimulating hormone (TSH) test and Triiodothyronine (T3) test.
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.
What should I ask my healthcare provider before having this test?
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