Clean, professional T3 test infographic comparing low vs high T3 levels with realistic thyroid-related icons, showing symptoms like fatigue, weight change, rapid heartbeat, and heat intolerance.

T3 (Triiodothyronine) Test – Normal Range, Function, High & Low T3 Levels Explained

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The T3 (Triiodothyronine) test measures active thyroid hormone levels to evaluate thyroid function. Learn about its normal range, function, causes, and symptoms of high and low T3. This test helps diagnose hypothyroidism, hyperthyroidism, and other thyroid-related disorders.

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