Thyroid suppression test is a diagnostic procedure used to evaluate cases of hyperthyroidism by assessing the function of the thyroid gland. It involves the administration of a medication to suppress thyroid activity, followed by monitoring thyroid hormone levels through blood tests.

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Thyroid Suppression Test FAQ


What is a thyroid suppression test?

A thyroid suppression test is a diagnostic procedure used to evaluate thyroid function, mainly to assess cases of hyperthyroidism.

How is the test performed?

The test involves taking a medication to suppress thyroid activity, then a series of blood tests to monitor thyroid hormone levels.

Why is the test conducted?

The test is conducted to assess the function of the thyroid gland and to investigate cases of hyperthyroidism.

What medications are used for the test?

Commonly used medications include levothyroxine and liothyronine.

How long does the test take?

The test usually involves multiple blood draws and can take several hours to complete.

Are there any risks associated with the test?

The test involves taking medications that can have potential side effects such as palpitations, anxiety, and insomnia.

Can I eat before the test?

It is usually recommended to fast before the test, so follow the specific instructions provided by your healthcare provider.

What do the results indicate?

The results help in determining the function of the thyroid gland and in diagnosing hyperthyroidism.

Are there any alternatives to this test?

Other tests for evaluating thyroid function include thyroid-stimulating hormone (TSH) tests and imaging tests such as thyroid ultrasound or scintigraphy.

Who should undergo this test?

Individuals displaying symptoms of hyperthyroidism or those with risk factors for thyroid disorders may undergo this test.

Is the test painful?

The test typically involves only a small amount of discomfort associated with the blood draw.

Can I take my regular medications on the day of the test?

It is important to consult with your healthcare provider whether to adjust or withhold any regular medications before the test.

Is there any special preparation required for the test?

Your healthcare provider will provide specific instructions, which may include fasting before the test.

How soon are the test results available?

The test results are usually available within a few days after the blood samples are taken.

Can I drive myself home after the test?

It is advisable to have someone accompany you for the test, as some individuals may feel lightheaded or fatigued after the procedure.

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Information provided by Maryam Abdullahi-Mahdi. Reviewed by Mr. Matthew Liew