A transrectal ultrasound is often used to help diagnose prostate cancer if the prostate-specific antigen (PSA) level is high, the doctor feels an abnormal area during a digital rectal exam (DRE), prostate cancer is suspected after a magnetic resonance imaging (MRI)-ultrasound fusion targeted biopsy, or a man has certain symptoms, such as trouble urinating.
A transrectal ultrasound is done to:
- look for abnormal areas in the prostate
- guide a needle during a biopsy to collect samples from the prostate
- look at the size and shape of the prostate