Scrotal ultrasound is an imaging test that looks at the scrotum. The scrotum is the flesh-covered sac that hangs between the legs at the base of the penis and contains the testicles.
The testicles are the male reproductive organs that produce sperm and the hormone testosterone. They are located in the scrotum, along with other small organs, blood vessels, and a small tube called the vas deferens.
How the Test is Performed
You lie on your back with your legs spread. The health care provider drapes a cloth across your thighs under the scrotum or applies wide strips of adhesive tape to the area. The scrotal sac will be slightly raised with the testicles lying side by side.
A clear gel is applied to the scrotal sac to help transmit the sound waves. A handheld probe (the ultrasound transducer) is then moved over the scrotum by the technologist. The ultrasound machine sends out high-frequency sound waves. These waves reflect off areas in the scrotum to create a picture.
How to Prepare for the Test
No special preparation is needed for this test.
How the Test will Feel
There is little discomfort. The conducting gel may feel slightly cold and wet.
Why the Test is Performed
A testicle ultrasound is done to:
- Help determine why one or both testicles have become larger
- Look at a mass or lump in one or both of the testicles
- Find the reason for pain in the testicles
- Show how blood flows through the testicles
The testicles and other areas in the scrotum appear normal.
There are no known risks. You will not be exposed to radiation with this test.
In certain cases, Doppler ultrasound may help identify blood flow inside the scrotum. This method can be helpful in cases of testicular torsion because blood flow to the twisted testicle may be reduced.
Testicular ultrasound; Testicular sonogram
Gilbert BR, Fulgham PF. Urinary tract imaging: basic principles of urologic ultrasonography. In: Partin AW, Dmochowski RR, Kavoussi LR, Peters CA, eds. Campbell-Walsh-Wein Urology. 12th ed. Philadelphia, PA: Elsevier; 2021:chap 4.
Owen CA. Scrotum. In: Hagen-Ansert SL, ed. Textbook of Diagnostic Sonography. 8th ed. St Louis, MO: Elsevier; 2018:chap 23.
Sommers D, Winter T. The scrotum. In: Rumack CM, Levine D, eds. Diagnostic Ultrasound. 5th ed. Philadelphia, PA: Elsevier; 2018:chap 22.
Review Date 4/2/2022
Updated by: Jason Levy, MD, FSIR, Northside Radiology Associates, Atlanta, GA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.