A thyroid ultrasound is an imaging method used to see the thyroid gland. The thyroid is a gland located in the neck that regulates metabolism. Ultrasound is a painless method that uses sound waves to create images of the inside of the body.

The test is usually done in the ultrasound or radiology department. You will lie with your neck hyperextended (extended beyond its usual limit). A lubricating gel will be placed onto your neck. Next, the ultrasound technician will move a wand, called a transducer, over the area.

The transducer gives off sound waves. The sound waves go through the body and bounce off the area being studied (in this case, the thyroid gland). A computer looks at the pattern that the sound waves create when bouncing back, and creates an image.

No special preparation is necessary for this test.

You should feel very little discomfort with this test. The gel may be cold.