Thyroid test normal range

Definition A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland. It prompts the thyroid gland to make and release thyroid hormones into the blood. Alternative Names Thyrotropin; Thyroid stimulating hormone; Hypothyroidism - TSH; Hyperthyroidism - TSH; Goiter - TSH How the Test is Performed A blood sample is needed. Other thyroid tests that may be done at the same time include: • T3 test (free or total) • T4 test (free or total) How to Prepare for the Test There is no preparation needed for this test. Ask your health care provider about any medicines you are taking that may affect the test results. DO NOT stop taking any medicines without first asking your provider. Medicines you may need to stop for a short time include: • Amiodarone • Dopamine • Lithium • Potassium iodide • Prednisone or other glucocorticoid medicines The vitamin biotin (B7) can affect the results of the TSH test. If you take biotin, talk to your provider before you have any thyroid function tests. How the Test will Feel When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away. Why the Test is Performed Your provider will order this test if you have symptoms or signs of an overactive or underactive thyroid gland. It is also used to monitor treatment of these conditions. Your provider may also check your T...