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Patient Preparation: No special preparation is required
Free T4 is the metabolically active fraction of thyroxine. This assay is useful for diagnosing both Hypo / Hyperthyroidism.
Your doctor will recommend this test for you if you have the symptoms of hypo or hyper-thyroidism.
Symptoms of Hypothyroidism:
Sudden Weight Gain
Symptoms of Hyperthyroidism:
Increased Heart Rate
Thyroxine (T4) is a hormone, secreted by the thyroid gland (small, butterfly-shaped gland located in front of the neck). The T4 hormone is essential for growth and metabolism. T4 circulates in the blood in two forms: free form (FT4) and bound form.
Sample: Serum (2 mL)