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Thyroid-Stimulating Hormone (TSH) Test: About This Test

What is it?

A thyroid-stimulating hormone (TSH) test is one of several blood tests used to check for thyroid gland problems. TSH causes the thyroid gland to make other important hormones that help control your body's metabolism.

Why is this test done?

This test is done to:

Find out if the thyroid gland is working as it should.
Find out if a problem with the thyroid is causing symptoms such as growth problems, tiredness, weight gain, or weight loss.
Keep track of how well thyroid treatment is working.
Test a newborn to find out if his or her thyroid gland is working as it should.

How do you prepare for the test?

In general, there's nothing you have to do before this test, unless your doctor tells you to.

Talk to your doctor about all of your health conditions before the test. For example, tell your doctor about all medicines you take. If you take thyroid medicines, tell your doctor when you took the last dose. You may need to stop taking thyroid medicines for a short time before having these tests. Extreme stress and illness can also affect thyroid test results.

How is the test done?

A health professional uses a needle to take a blood sample, usually from the arm.

How long does the test take?

The test will take a few minutes.

What happens after the test?

You will probably be able to go home right away.
You can go back to your usual activities right away.

Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.

Where can you learn more?

Go to https://www.healthwise.net/patientEd

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