Common reasons for prostate ultrasound are to look for causes of pelvic pain as well as diagnostic evaluation for prostate cancer, benign prostatic enlargement, prostatitis, prostatic abscesses, and male infertility. Gray scale, color Doppler, and power Doppler may be used . Diagnostic ultrasound is also useful in measuring the size of the prostate gland and determining the prostate volume. Trans-abdominal ultrasound with a full bladder is useful for a panoramic view of the prostate and surrounding structures. Transrectal prostate ultrasound may also be done if necessary.