Thyroid Testsenparentshttps://kidshealth.org/EN/images/headers/Thyroid_Tests_2.jpgThyroid blood tests check thyroid function and can help doctors diagnose thyroid disorders such as hypothyroidism and hyperthyroidism.thyroid, disease, disorder, diseases, disorders, hypothyroidism, hyperthyroidism, overactive, underactive, neck, swollen, hormone, hormones, graves disease, hashimoto disease, immunity, immune, autoimmune, immune system, goiter, pituitary, gland, depression, depressed, weight, radioactive iodine, secrete, secretes, secretion, endocrine, endocrinary, endocrine system, needle biopsy, neoplasia, thyroiditis, deficiency, deficient, what does, mean?, neoplasm, neoplasms, what are the signs of thyroid disease?, how do people know if they have thyroid disease?, what is thyroid disease?thyroiditis, thyroid hormones, hormones, metabolism, endocrinologist, rheumatologist, genetics, genetic, hypothyroidism, hyperthyroidism, amino acids, autoimmune diseases, biopsy, irregular menstrual periods, radioactive iodine, goiters, thyroid nodules, thyroid scan, how does my thyroid affect my growth, thyroxine, triiodothyronine, cysts, tumors, my neck is swollen, CD1Endocrinology09/28/201711/04/201911/04/2019Steven Dowshen, MD07/12/20185dc5d0a7-d45d-4fd2-9cd4-bb534bf1d7b3https://kidshealth.org/ws/RadyChildrens/en/parents/thyroid-tests.html/<h3>What Is the Thyroid?</h3> <p>The <strong>thyroid</strong> is a small <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/endocrine.html/">gland</a> below the skin and muscles at the front of the neck, at the spot where a bow tie would rest. It makes two types of thyroid hormones: T3 (triiodothyronine) and T4 (thyroxine). It helps the body do many things, such as get energy from food, grow, and go through <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/development-foyer.html/">sexual development</a>.</p> <p>The <strong>pituitary</strong> is a pea-sized gland at the bottom of the brain that makes thyroid stimulating hormone (TSH). TSH triggers the thyroid to make more thyroid hormone. The pituitary gland and the thyroid gland send messages back and forth to each other about how much hormone to make to keep the levels normal.</p> <p><img class="center_this" title="A view of the thyroid, a gland below the skin and muscles at the front of the neck, as described in the article." src="https://kidshealth.org/EN/images/illustrations/thyroid_a_enIL.jpg" alt="A view of the thyroid, a gland below the skin and muscles at the front of the neck, as described in the article." /></p> <h3>What Is Thyroid Disease?</h3> <p>Some diseases of the thyroid or pituitary gland cause the thyroid to make too much or not enough thyroid hormone:</p> <ul class="kh_longline_list"> <li>If the thyroid is overactive, it releases too much thyroid hormone, causing <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/hyperthyroidism.html/"><strong>hyperthyroidism</strong></a>. The body use up energy more quickly than it should, and chemical activity (like metabolism) in the cells speeds up. Symptoms include sweating, trembling, weight loss, and fast heartbeat.</li> <li>If the thyroid is underactive, it makes too little thyroid hormone, causing <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/hypothyroidism.html/"><strong>hypothyroidism</strong></a>. The body uses up energy more slowly, and chemical activity (metabolism) in the cells slows down. Symptoms include tiredness, feeling cold, constipation, dry skin, and slow height growth in children.</li> </ul> <h3>What Are Thyroid Blood Tests?</h3> <p>Doctors use blood tests to check for thyroid or pituitary problems. In kids already diagnosed with thyroid or pituitary problems, the tests are used to guide treatment.</p> <p>Commonly ordered thyroid blood tests include:</p> <ul class="kh_longline_list"> <li><strong><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/test-t4.html/">T4 test</a>:</strong> This is done to measure the blood level of the hormone T4 (<strong>thyroxine</strong>). It might be done in one or both of the following ways: <ul> <li><strong>total T4,</strong> which measures the entire amount of thyroxine in the blood, including the amount attached to blood proteins that help carry the hormone through the bloodstream</li> <li><strong>free T4,</strong> which measures only the thyroxine that's not attached to proteins. This is the part of T4 in the blood that affects how the body's cells work.<br />The results of the T4 blood tests can help diagnose hyperthyroidism or hypothyroidism and guide treatment.</li> </ul> </li> <li><strong><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/test-tsh.html/">TSH test</a>: </strong>A thyroid stimulating hormone (TSH) test can help tell how well the thyroid is working. If a thyroid disease prevents the gland from making enough thyroid hormone, the pituitary gland releases more TSH into the blood. If the thyroid is making too much thyroid hormone, the pituitary releases less TSH, which can lower the levels of TSH in the blood.</li> <li><strong><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/t3.html/">T3 total test</a>: </strong>The T3 total test measures the other major thyroid hormone in the blood. It often helps doctors diagnose hyperthyroidism.</li> <li><strong><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/test-tgab.html/">thyroid antibodies test</a>: </strong>Hashimoto's thyroiditis is an autoimmune condition in which the <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/immune.html/">immune system</a> attacks the thyroid gland. To diagnose it, doctors check for high levels of antibodies that are a sign of the immune system's attack on proteins in the thyroid gland. Usually, two types of thyroid antibodies are measured: <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/test-tgab.html/">thyroglobulin antibodies (TgAb)</a> and <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/test-peroxidase.html/">thyroid peroxidase antibodies (TPO)</a>.</li> </ul> <p>In some cases, abnormal thyroid test results can be due to a medicine, an ongoing medical condition, or pregnancy. In these cases, there may be nothing wrong with the thyroid or pituitary glands themselves.</p> <p><img class="center_this" title="A view of the thyroid gland, at the front of the neck, and pituitary gland, at the base of the brain, as described in the article." src="/EN/images/illustrations/thyroid&amp;pituitary_400x400_enIL.jpg" alt="A view of the thyroid gland, at the front of the neck, and pituitary gland, at the base of the brain, as described in the article." /></p> <p>The normal ranges of thyroid function test results vary by age. Doctors think about this carefully when they interpret them.</p> <h3>What if I Have Questions?</h3> <p>If you have any questions about a thyroid blood test, speak with your doctor. You can also talk to the technician who's doing the blood draw before the procedure.</p>
Blood Test: T3 Resin Uptake (T3RU)Doctors may order the T3 resin uptake when a child's symptoms or previous blood tests seem to suggest thyroid dysfunction.https://kidshealth.org/ws/RadyChildrens/en/parents/test-t3ru.html/93ece2e7-eb5b-485d-8baf-c1b2f5c8d3a0
Blood Test: T3 Total (Triiodothyronine)The T3 total test is part of an evaluation of thyroid function. It's particularly useful in diagnosing hyperthyroidism, which can cause symptoms such as a fast heart rate, weight loss, trembling and sweating.https://kidshealth.org/ws/RadyChildrens/en/parents/t3.html/71ac8399-590a-459a-ad68-8c96ae612023
Blood Test: T4 (Thyroxine)Doctors may order the T4 blood test if symptoms suggest any kind of thyroid disorder.https://kidshealth.org/ws/RadyChildrens/en/parents/test-t4.html/ef66633d-7883-4a10-bcf5-146b082519e2
Blood Test: Thyroglobulin Antibodies (TgAb)The thyroglobulin antibodies test is used to help diagnose autoimmune conditions involving the thyroid gland, or when thyroid disorders are suspected.https://kidshealth.org/ws/RadyChildrens/en/parents/test-tgab.html/a8e2e8e9-3fc1-4bfd-af13-f2c110a0765e
Blood Test: Thyroid Peroxidase AntibodiesThe thyroid peroxidase antibodies test is primarily used to help diagnose and monitor autoimmune conditions involving the thyroid gland, including Hashimoto's thyroiditis and Graves disease.https://kidshealth.org/ws/RadyChildrens/en/parents/test-peroxidase.html/04fa9666-9d47-4c66-9a18-bdc2dfbbf07f
Blood Test: Thyroid Stimulating Hormone (TSH)Doctors may order TSH blood tests to diagnose and monitor treatment of a thyroid disorder or evaluate pituitary gland functioning.https://kidshealth.org/ws/RadyChildrens/en/parents/test-tsh.html/27d85679-3382-4e15-a597-774fcc97ef77
CAT Scan: NeckA neck CAT scan can detect signs of disease in the throat and surrounding areas. Doctors may order one to detect abscesses, birth defects, cysts, or tumors.https://kidshealth.org/ws/RadyChildrens/en/parents/scan-neck.html/3900989f-95ab-4590-b08d-ea97a75ff1b9
Congenital HypothyroidismSome babies are born with a thyroid gland that didn't develop correctly or doesn't work as it should. This is called congenital hypothyroidism.https://kidshealth.org/ws/RadyChildrens/en/parents/congenital-hypothyroidism.html/cf233f9f-7012-4613-8f89-3e68818fae3a
Goiters and Thyroid NodulesAn enlarged thyroid gland is a lump that can be felt under the skin at the front of the neck. When it's big enough to see easily, it's called a goiter. A thyroid nodule is a lump or enlarged area in the thyroid gland.https://kidshealth.org/ws/RadyChildrens/en/parents/goiter.html/d64d8507-bbce-435d-8662-fa6a1f1726fa
Hyperthyroidism and Graves’ Disease Hyperthyroidism happens when the thyroid gland sends too much thyroid hormone into the blood. The most common cause of hyperthyroidism is Graves' disease.https://kidshealth.org/ws/RadyChildrens/en/parents/hyperthyroidism.html/95857eb0-5b82-4454-b9c9-418e19008b30
Hypothyroidism and Hashimoto’s ThyroiditisAn underactive thyroid makes too little thyroid hormone, causing hypothyroidism. Hashimoto's thyroiditis, which causes most cases of hypothyroidism in kids and teens, is a condition in which the immune system attacks the thyroid.https://kidshealth.org/ws/RadyChildrens/en/parents/hypothyroidism.html/8efef5d8-104a-4baa-878c-a02884d9f4af
Thyroid DiseaseThe thyroid gland makes the hormones that help control metabolism and growth. A thyroid that isn't working properly can cause thyroid disease. https://kidshealth.org/ws/RadyChildrens/en/parents/thyroid-disease.html/84573bd7-3de9-46b0-b1af-0f7a762c5d48
What Is the Thyroid?Do you know just how important the thyroid is? It helps you grow and affects your energy level.https://kidshealth.org/ws/RadyChildrens/en/kids/thyroid.html/8484750c-4f47-4003-aaec-eb0992df2964
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