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
Dry Skin
Constipation
Puffy Skin
Hair Loss
Fatigue
Menstrual Irregularity
Symptoms of Hyperthyroidism:
Increased Heart Rate
Anxiety
Weight Loss
Tremors
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)
Methodology: CLIA