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A thyroid and parathyroid ultrasound is an imaging test to check the thyroid gland and parathyroid glands. A thyroid ultrasound can help measure the size and shape of the thyroid gland, but it cannot tell how well the thyroid gland is working. Ultrasound also may be used to check the four parathyroid glands that lie behind or next to the thyroid.
The thyroid gland makes a hormone called thyroxine that controls how fast the body converts food into energy (metabolism). Parathyroid hormone (PTH) is made by the parathyroid glands and controls the amount of calcium and phosphorus in the blood.
During a thyroid and parathyroid ultrasound, a small handheld instrument called a transducer is passed back and forth over the neck to form a picture of the thyroid gland and parathyroid glands.
A thyroid and parathyroid ultrasound is done to:
No special preparation is required before having this test. You will need to remove jewelry from your head or neck before the test.
Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results may mean. To help you understand the importance of this test, fill out the medical test information form(What is a PDF document?).
A thyroid and parathyroid ultrasound is usually done by a radiologist or by an ultrasound technologist. It is done in an ultrasound room in a doctor's office or hospital.
You may be asked to undress above the waist and drape a paper or cloth covering around your shoulders. Remove all jewelry from your head or around your neck.
You will lie on your back on a high table with your neck stretched out and a pillow under your shoulders. Gel will be spread on your neck to improve the passage of the sound waves (they do not pass easily through air). Sometimes a small water-filled bag or gelatin sponge is placed over your throat to help conduct the sound waves. The transducer will be pressed against your neck (or against the water-filled bag or gelatin sponge, if used), then moved back and forth over your neck. A picture of your thyroid gland and the tissue around it can be seen on a video monitor. You may be asked to turn your head away from the side being scanned so the jawbone is out of the way.
The test takes about 30 minutes. You may be asked to wait until the radiologist has reviewed the information. The radiologist may want to do additional ultrasound views of your neck.
The gel may feel cold when it is applied to your neck. Keeping your neck extended during the test may be uncomfortable, but you should not feel discomfort from the transducer or sound waves. You will be able to breathe and swallow normally during the test, and you will not hear the sound waves.
There is very little chance of a problem from a thyroid or parathyroid ultrasound test.
A thyroid ultrasound test does not use radiation, so it is safe to use during pregnancy and will not harm your growing baby.
A thyroid and parathyroid ultrasound is an imaging test to check the thyroid gland and parathyroid glands. The results of a thyroid or parathyroid ultrasound test are usually available within 2 to 3 days.
The thyroid gland and parathyroid glands are the right shape and are in the right place.
The glands are not too big or too small.
No growths or other abnormalities are seen.
The parathyroid glands are too big.
Reasons you may not be able to have the test or why the results may not be helpful include:
Other Works Consulted
- Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby.
|Primary Medical Reviewer||E. Gregory Thompson, MD - Internal Medicine|
|Specialist Medical Reviewer||Matthew I. Kim, MD - Endocrinology|
|Last Revised||April 5, 2012|
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