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Health Library Home>Conditions InDepth>Article

Diagnosis of Hyperthyroidism

by Editorial Staff and Contributors
En Español (Spanish Version)
Main Page
Risk Factors
Symptoms
Diagnosis
Treatment
Screening
Reducing Your Risk
Talking to Your Doctor
Resource Guide

Your doctor will ask about your symptoms, medical history, and family history. A physical exam will be done. Recommended tests may include:

Blood Tests

These tests measure the blood levels of thyroid hormones. This can be done by checking levels of thyroid stimulating hormone (TSH), free T4, and at times, free T3. The levels of these hormones determine the activity of the thyroid gland. Your blood may also be examined for thyroid antibodies, especially if you are pregnant.

Radioiodine Uptake

This test is used to help define the cause of hyperthyroidism. The thyroid gland uses iodine to make thyroid hormones. For this test, you will orally ingest radioactive iodine. Some of it is taken up by the thyroid gland. The amount of radioactivity is then measured by a radiation counter. In Graves disease, the amount is elevated. This test is not done on children or pregnant women.

Thyroid Scan

This test may be done at the same time as the radioiodine uptake to evaluate one or more problematic nodules. If suspected on exam, a thyroid ultrasound may also be done. A thyroid nodule may or may not be functioning and is termed hot if it makes too much thyroid hormone, or cold if it does not make any.

REFERENCES:

Hyperthyroidism. Endocrine Society Hormone Health Network website. Available at: http://www.hormone.org/questions-and-answers/2010/hyperthyroidism. Accessed November 28, 2017.

Hyperthyroidism and thyrotoxicosis. EBSCO DynaMed Plus website. Available at:http://www.dynamed.com/topics/dmp~AN~T116479/Hyperthyroidism-and-thyrotoxicosis. Updated July 27, 2017. Accessed November 28, 2017.

Vaidya B, Pearce SH. Diagnosis and management of thyrotoxicosis. Brit Med J. 2014;349:g5128.

Wu SY, Weiss RE. Radioiodine imaging in the primary care of thyroid disease. Postgrad Med. 2006;119(2):70-77.

Last reviewed November 2018 by EBSCO Medical Review Board James Cornell, MD  Last Updated: 12/20/2014

EBSCO Information Services is fully accredited by URAC. URAC is an independent, nonprofit health care accrediting organization dedicated to promoting health care quality through accreditation, certification and commendation.

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

To send comments or feedback to our Editorial Team regarding the content please email us at healthlibrarysupport@ebsco.com. Our Health Library Support team will respond to your email request within 2 business days.

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4600 38th Street
P.O. Box 1800
Columbus, Nebraska 68602-1800
T: 402-564-7118
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