If d0ne transrectally, Use a mild enema 1–2 hours before the scan to empty the rectum. This helps improve image quality.

If done transabdominally, a full bladder is required, Drink at least 4 to 6 glasses of water an hour before the exam.

No fasting is required.

You will typically lie on your side with your knees bent (transrectally) or on your back (transabdominally). 

Transrectally, A small, lubricated ultrasound probe (transducer) is gently inserted into the rectum. ​

Some individuals may experience mild discomfort or pressure during probe insertion and while the probe is in place. 

Wear comfortable clothing. You may be asked to change into a gown.