Skip to content

Women's Health

Font Size

Thyroid and Parathyroid Ultrasound

How It Feels

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 camera.gif. The results of a thyroid or parathyroid ultrasound test are usually available within 2 to 3 days.

Thyroid and parathyroid ultrasound

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 thyroid gland is too big (goiter) or a growth (thyroid nodule) or cyst is seen in the thyroid gland.

The parathyroid glands are too big.

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

  • Not being able to hold still during the procedure. Movement can interfere with the quality of the ultrasound picture.
  • Having an open wound in the area that needs to be viewed.

What To Think About

  • A radioactive thyroid scan and radioactive iodine uptake (RAIU) test are nuclear medicine tests that use a radioactive substance to see how well the thyroid is working and identify thyroid problems. For more information, see the topic Thyroid Scan.
  • A thyroid ultrasound does not use a radioactive substance; it is easier to perform and is less expensive than a radioactive thyroid scan or RAIU test. But a thyroid ultrasound does not provide information about how well the thyroid gland is working.
  • A thyroid ultrasound may be done at the same time as an RAIU test. RAIU testing is used more often than a thyroid ultrasound to identify problems such as hyperthyroidism. A thyroid ultrasound can be used to identify different types of thyroid problems, especially problems such as thyroid nodules.
  • Thyroid nodules are common, especially in women and older people.
  • Thyroid ultrasound can usually show the difference between a cyst, a solid nodule, or another type of mass that needs further testing. A fluid-filled sac that is smooth and round and that does not have any particles floating in it is likely to be a simple cyst. A lump that does not have any fluid or that has fluid with floating particles needs to be checked more closely. If a solid nodule is found, a thyroid biopsy may be needed.

WebMD Medical Reference from Healthwise

Last Updated: April 05, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

Today on WebMD

hands on abdomen
Test your knowledge.
womans hand on abdomen
Are you ready for baby?
birth control pills
Learn about your options.
Is it menopause or something else?
Couple with troubles
Bone density illustration
Young woman being vaccinated
woman holding hand to ear

Send yourself a link to download the app.

Loading ...

Please wait...

This feature is temporarily unavailable. Please try again later.


Now check your email account on your mobile phone to download your new app.

Blood pressure check
mother and daughter talking
intimate couple
puppy eating