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Diagnosis of Hyperthyroidism

Authors:
  • Editorial Staff and Contributors
Publication Type:

ConditionInDepth

Diagnosis of Hyperthyroidism

The doctor will ask about symptoms, past health, and family health. A physical exam will be done. Tests may include:

Blood Tests

Blood tests measure 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. Blood may also be checked for thyroid antibodies. Thyroid antibodies develop when the immune system attacks the thyroid.

Blood Tests

Blood tests measure 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. Blood may also be checked for thyroid antibodies. Thyroid antibodies develop when the immune system attacks the thyroid.

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, a person swallows radioactive iodine. Some of it is taken up by the thyroid gland. The amount of radioactivity is then measured. In Graves disease , the amount is elevated. This test is not done on children or pregnant women.

Thyroid Scan

This test may be done with the radioiodine uptake. It can help find the cause of hyperthyroidism if a person has thyroid nodules (lumps).

References

  • Hyperthyroidism. Endocrine Society website. Available at:https://www.endocrine.org/patient-engagement/endocrine-library/hyperthyroidism.
  • Hyperthyroidism and other causes of thyrotoxicosis. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/hyperthyroidism-and-other-causes-of-thyrotoxicosis-37.
  • Ross DS, Burch HB, et al. 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis. Thyroid. 2016;26(10):1343-1421.

Contributors

  • Mark Arredondo, MD
Last Updated:
2022-11-01

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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.