The FT3 test measures the active form of thyroid hormone in the blood, which helps regulate metabolism, energy, and growth. It specifically measures the unbound (free) triiodothyronine, offering a clearer view of thyroid function.
This test is used to detect hyperthyroidism, hypothyroidism, or monitor thyroid treatment, especially when symptoms like weight changes, fatigue, or rapid heartbeat are present. It’s often done along with TSH and T4 tests for a complete thyroid check.
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FT3 (ECLIA)
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