Thyroid Panel, Total

The thyroid gland is a butterfly-shaped organ located in the neck and produces hormones like thyroxine (T4) and triiodothyronine (T3), which regulate metabolism and other bodily functions. The production and release of these hormones are controlled by the thyroid-stimulating hormone (TSH) produced by the pituitary gland.

A Thyroid Panel, Total assesses the health of your thyroid gland and aids in the diagnosis and management of thyroid disorders, such as an overactive thyroid gland (hyperthyroidism) or an underactive thyroid gland (hypothyroidism). Your doctor may advise this test if you show symptoms suggestive of hyperthyroidism, such as weight loss, nervousness, irritability, increased sweating, and rapid heartbeat, or hypothyroidism, such as weight gain, fatigue, sensitivity to cold, constipation, and dry skin. This test is also recommended for women during pregnancy to check if they have adequate amounts of thyroid hormones, as these hormones are necessary for the healthy development of babies.

No special preparations are needed for this test. Usually, you do not need to stop taking your thyroid medication before taking this test. However, inform your doctor about all your medicines, as some can affect thyroid function. Biotin (Vitamin B7) is a commonly taken over-the-counter supplement that can lead to some aberrancy in your thyroid function test results even when the values are normal. Therefore, avoid taking biotin two days before this test.

Test result ranges are approximate and may differ slightly between labs depending on the methodology and laboratory guidelines. The test results will help your doctor determine your medical condition, make recommendations for lifestyle modifications such as diet and exercise, decide whether or not medication will be required to manage your condition, and formulate your overall treatment plan.