A testicular ultrasound (sonogram) is a test that uses reflected sound waves to produce a picture of the testicles and scrotum. An ultrasound can show the long, tightly coiled tube that lies behind each testicle and collects sperm (epididymis) and the tube (vas deferens) that connects the testicles to the prostate gland. The ultrasound does not use X-rays or other types of radiation. See an illustration of the male reproductive system.

A small handheld instrument called a transducer is passed back and forth over the scrotum. The transducer sends the sound waves to the computer which converts them into a picture that is displayed on a video monitor. The picture produced by ultrasound is called a sonogram, echogram, or scan. Pictures or videos of the ultrasound images may be saved as a permanent record.

Why It Is Done

Testicular ultrasound is done to:

• Evaluate a mass or pain in the testicles.
• Identify and monitor infection or inflammation of the testicles or epididymis.
• Identify twisting of the spermatic cord cutting off blood supply to the testicles (testicular torsion).
• Monitor for recurrence of testicular cancer.
• Locate an undescended testicle.
• Identify fluid in the scrotum (hydrocele), fluid in the epididymis (spermatocele), blood in the scrotum (hematocele), or pus in the scrotum (pyocele).
• Guide a biopsy needle for testicular biopsy when testing for infertility.
• Evaluate an injury to the genital area.

How To Prepare

No special preparation is needed for a testicular ultrasound.

If you are having a biopsy or another test during the ultrasound, you may need to sign a consent form.

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 will indicate. To help you understand the importance of this test, fill out the medical test information form (What is a PDF document?) .

How It Is Done

A testicular ultrasound is usually done by an ultrasound technologist. It is done in an ultrasound room in a doctor's office or hospital.

You will need to remove all your clothes from the waist down and put on a gown before the test. You will be asked to lie on your back on a padded examination table. Folded towels will be used to cover the penis and lift the scrotum. A gel (such as K-Y Jelly) will be spread on your scrotum for the transducer. The transducer is pressed against your skin and moved across your scrotum many times.

You will need to lie very still during the ultrasound scan. You may be asked to take a breath and hold it for several seconds during the scanning. Testicular ultrasound takes about 20 minutes.

When the test is finished, the gel is removed from your skin. You may be asked to wait until the radiologist has reviewed the information. The radiologist may want to do additional ultrasound views.