Thyroid TSH Function Test

Noticeable changes in your metabolism (eg, weight, temperature, and energy) may be an indication of abnormal levels of thyroid stimulating hormone (TSH) in your blood. This thyroid function test measures the TSH levels in your blood to help identify these abnormalities. High TSH levels may indicate an overactive thyroid (ie, hyperthyroidism), while low TSH levels may suggest an underactive thyroid (ie, hypothyroidism). In either case, T4 reflex testing will be performed at no additional cost to help identify a possible thyroid disorder.

The thyroid is a butterfly-shaped gland in the front of the neck. Thyroid function is controlled by the pituitary gland, which produces TSH and releases it into the bloodstream. TSH stimulates the thyroid gland to produce thyroid hormones (T3 and T4). TSH will also tell the body to make or release thyroid hormones. This process determines how quickly your body uses energy, makes proteins, and controls other important functions, such as: body temperature, heart rate, breathing, skin moisture, muscle contraction, weight gain or loss, brain development, cholesterol levels, menstruation, and nervous system function.

Thyroid disorders can affect any system of your body and treatment will depend on the specific thyroid condition. An undiagnosed thyroid disorder may put you at risk for cardiovascular diseases, osteoporosis, infertility, and other serious conditions; most thyroid conditions can be managed with medication.

Buy your own thyroid function test online with Quest. No doctor’s visit is required – simply purchase TSH testing, visit a nearby Quest® location for sample collection, and get fast results. Included with your purchase, if your test results are abnormal, an independent physician may be able to provide you with treatment options.