The Free T4 Serum Test measures the level of free thyroxine (T4) hormone in the blood, which is not bound to proteins and is biologically active. Thyroxine plays a vital role in regulating metabolism, energy production, and overall thyroid function. This test is commonly prescribed to diagnose thyroid disorders such as hypothyroidism or hyperthyroidism and to monitor the effectiveness of thyroid treatments. The Free T4 test is essential for identifying abnormal thyroid function and works in conjunction with other thyroid function tests, such as TSH and Total T4.

Abnormal Free T4 levels can indicate: High Free T4 Levels: Hyperthyroidism (overactive thyroid) Graves’ disease Thyroid nodules Pituitary gland issues Low Free T4 Levels: Hypothyroidism (underactive thyroid) Hashimoto’s thyroiditis Iodine deficiency Chronic illness Identifying these imbalances early helps prevent complications such as heart problems, weight changes, and mood disorders.

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