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Thyroxine (T4), Free, Direct (Free T4) LabCorp

SKU

349-l

This test measures the total amount of thyroid hormone T4 (thyroxine) in the blood, which can help identify a thyroid disorder.

LabCorp Test #: 001974, CPT: 84439

Details

This test measures the amount of free thyroxine, a hormone made by your thyroid gland, in your blood. Free T4 is the active form of the hormone that affects your body's metabolism. It helps diagnose thyroid conditions like hyperthyroidism or hypothyroidism.

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Symptoms	Cold intolerance, Constipation, Dry skin, Fatigue, Hair loss, Weight gain