The T3 test measures triiodothyronine, a thyroid hormone that helps regulate metabolism, heart rate, and body temperature. It’s used to diagnose thyroid disorders like hyperthyroidism or hypothyroidism, especially when symptoms such as fatigue, weight changes, or rapid heartbeat are present.
Often done alongside T4 and TSH, this test also helps monitor thyroid treatment and assess overall thyroid function.
No fasting required.
Do not take Biotin (Vitamin B7) for 8 hours prior to extraction.
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