This test measures the blood levels of triiodothyronine, a thyroid hormone.
This test checks the blood level of T3 (triiodothyronine), a hormone made by the thyroid gland. It is often done along with or after a thyroid-stimulating hormone (TSH) test and thyroxine (T4) test.
In an adult, the blood sample is taken from a vein in the arm. If this test is done on an infant, blood is collected by pricking the heel or finger.
What should I ask my healthcare provider before having this test?
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