This blood test measures the level of one of the hormones made by the thyroid gland, total triiodothyronine (T3).
Thyroid hormones help control how the body uses energy. They are also associated with managing body temperature, muscle function, heart rates and mental functioning. This blood test measures the level of total triiodothyronine, or T3.
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.
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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