A Thyroid Panel (Free T3, Free T4, TSH) is a blood test that measures the levels of several hormones produced by the thyroid gland, including:
Free T3: Triiodothyronine (T3) is one of the thyroid hormones that plays an important role in regulating metabolism and energy production. Free T3 is the active form of T3 that is not bound to protein and is available for use by the body.
Free T4: Thyroxine (T4) is another thyroid hormone that helps regulate metabolism and energy production. Free T4 is the active form of T4 that is not bound to protein and is available for use by the body.
TSH: Thyroid-stimulating hormone (TSH) is a hormone produced by the pituitary gland that stimulates the thyroid gland to produce T3 and T4. Elevated TSH levels can indicate an underactive thyroid (hypothyroidism), while low TSH levels can indicate an overactive thyroid (hyperthyroidism).
A Thyroid Panel is commonly ordered by doctors to evaluate thyroid function and diagnose thyroid disorders such as hypothyroidism, hyperthyroidism, and autoimmune thyroid diseases such as Hashimoto’s thyroiditis and Graves’ disease. Symptoms of thyroid disorders can include fatigue, weight changes, hair loss, sensitivity to cold or heat, and changes in heart rate.
In addition to a Thyroid Panel, your doctor may also order additional tests such as thyroid antibodies, a thyroid ultrasound, or a fine needle aspiration biopsy to help diagnose and manage thyroid disorders. It’s important to discuss your symptoms and medical history with your doctor to determine the appropriate tests and treatments for your individual situation.
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