For diagnosis of hypothyroidism and hyperthyroidism. Free thyroxine (free T4) tests are used to help evaluate thyroid function and diagnose thyroid diseases, including hyperthyroidism and hypothyroidism, usually after discovering that the thyroid stimulating hormone (TSH) level is abnormal.
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- WHAT IT TESTS: Measure T4 levels.
- WHY TAKE IT: Assess thyroid hormone function.
- REQUIRES FAST? No.