Sometimes, low T3 can also indicate starvation. According to the ATA , a person can develop an underactive thyroid due to autoimmune disease, or as a result of radiation treatment or thyroid surgery.
Sometimes, getting too much or too little iodine also causes symptoms. Treatment often includes levothyroxine medication, which replaces the hormones that the thyroid should produce.
This drug controls the symptoms of hypothyroidism, but it does not cure the condition. The ATA outline some other thyroid tests a doctor may order, including:. High levels can indicate hyperthyroidism, and low levels can be a sign of hypothyroidism. However, other factors can also influence T3 levels, including certain medications and pregnancy. Due to this, a doctor may need to run additional tests to determine whether someone has a thyroid condition.
A person's diet can affect the symptoms of hyperthyroidism. This article looks at which foods and nutrients to eat and which to avoid for an…. Graves' disease is the most common autoimmune condition in the U. It is characterized by an overactive thyroid gland and the immune system attacking…. Hypothyroidism is when the thyroid gland is not making enough hormones for good health.
Symptoms can progress slowly and be vague and hard to identify. Some supplements that claim to boost thyroid health are now commercially available. However, they could lead to dangerous complications. Learn more.
The thyroid gland produces hormones that affect metabolism, mood, breathing, heart rate, and more. Learn more about thyroid gland function. Avery's Diseases of the Newborn. Philadelphia, PA: Elsevier; chap Thyroid pathophysiology and diagnostic evaluation.
Williams Textbook of Endocrinology. Weiss RE, Refetoff S. Thyroid function testing. Endocrinology: Adult and Pediatric. Philadelphia, PA: Elsevier Saunders; chap Editorial team. How the Test is Performed A blood sample is needed. How to Prepare for the Test Your health care provider will tell you if you need to stop taking any medicines before the test that may affect your test result.
Drugs that can increase T3 measurements include: Birth control pills Clofibrate Estrogens Methadone Certain herbal remedies Drugs that can decrease T3 measurements include: Amiodarone Anabolic steroids Androgens Antithyroid drugs for example, propylthiouracil and methimazole Lithium Phenytoin Propranolol. Will I need to do anything to prepare for the test?
Are there any risks to the test? What do the results mean? If you have questions about your results, talk to your health care provider. Is there anything else I need to know about a T3 test? But your health care provider may order a T3 test during pregnancy if you have: Symptoms of thyroid disease A history of thyroid disease An autoimmune disease A family history of thyroid disease. Thyroid Function Tests; [cited Sep 29]; [about 2 screens]. Washington D. T3 Free and Total ; [updated Sep 20; cited Sep 29]; [about 2 screens].
Thyroid Hormone Tests; [cited Aug 4]; [about 3 screens]. Bethesda MD : U. T3 Test: Overview; [updated Sep 29; cited Sep 29]; [about 2 screens]. These are…. Snuff is a dried form of tobacco that can raise your risk of health problems. Learn how to quit, starting today. Health Conditions Discover Plan Connect. What Is a T3 Test? Medically reviewed by Elaine K. Luo, M. Why doctors perform T3 tests. Preparing for a T3 test. Procedure for a T3 test. What do abnormal T3 test results mean?
Risks of the T3 test. Read this next.
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