Free T4
Free Thyroxine - A thyroxine test helps diagnose disorders of the thyroid. The thyroid is a small, butterfly-shaped gland located near the throat. Your thyroid makes hormones that regulate the way your body uses energy. It also plays an important role in regulating your weight, body temperature, muscle strength, and even your mood. Thyroxine, also known as T4, is a type of thyroid hormone. This test measures the level of T4 in your blood. Too much or too little T4 can indicate thyroid disease.
Why a doctor may order this
To assess thyroid function and diagnose hormonal imbalances.
Why you may need this
When TSH is abnormal or thyroid symptoms persist — shows the actual circulating thyroid hormone.
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