Thyroid Ultrasound
Thyroid Ultrasound

Diagnostics & Testing

Thyroid Ultrasound

What is an ultrasound?

Ultrasound (also known as sonography or ultrasonography) is a diagnostic procedure that transmits high-frequency sound waves, inaudible to the human ear, through body tissues. The echoes are recorded and transformed into video or photographic images of the internal structures of the body.

Ultrasound images help in the diagnosis of a wide range of diseases and conditions. Ultrasound is used to create images of soft tissue structures, such as the gallbladder, liver, heart, kidney, female reproductive organs -- and even of fetuses still in the womb. Ultrasound can also detect blockages in the blood vessels.

Ultrasound may be used with other diagnostic procedures or by itself. Studies have shown that ultrasound is not hazardous. There are no harmful side effects. In addition, ultrasound does not use radiation, as X-ray tests do.

Before the test

The preparation for this test will depend on the type of ultrasound procedure your doctor has ordered. Some preparations include drinking a liter of water before the test to obtain better images. Other preparations may include eating a fat-free dinner the night before the test, or possibly fasting. The doctor, nurse, or receptionist will give you complete instructions prior to the exam.

What is a thyroid ultrasound?

A thyroid ultrasound examines the gland that is located centrally in a patient's lower neck. The test is used to assess the size of the gland and to find out if there are nodules or lesions within the gland.

On the day of the test

You may eat or drink as normal the day of the exam. There is no prep for the exam.

Your ultrasound test will be performed by a registered, specially trained technologist and interpreted by a board-certified radiologist.

During the test

You will lie flat on a padded examining table with your head at the back of a pillow so that it tips back. A warm, water-soluble gel is applied to the skin over the area to be examined. The gel does not harm your skin or stain your clothes. A probe is gently applied against the skin.

The ultrasound will take about 20-30 minutes to complete.

After the test

The results of your ultrasound are usually available within 24 hours after your test, Sunday through Thursday.

Your ordering physician will discuss the test results with you.

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