Transrectal Prostate Ultrasound

Prostate ultrasound by transrectal approach (TRUS) is a short outpatient scan where a small ultrasound probe is gently placed in the rectum to obtain detailed images of the prostate gland and nearby structures.

What is transrectal prostate ultrasound?

Transrectal prostate ultrasound, often called TRUS, uses sound waves to create real‑time images of the prostate and surrounding tissues. The probe sits just behind the prostate in the rectum, allowing your provider to see the size, shape, and any abnormal areas in high detail.

Why this exam is done

Your provider may recommend TRUS if you have an elevated PSA blood test, a nodule felt on digital rectal exam, or urinary symptoms such as difficulty or weak flow when passing urine. It is also used to guide prostate needle biopsies when there is concern for conditions such as benign enlargement, prostatitis, or possible prostate cancer.

How to prepare

You may be asked to use a small rectal enema before the test to help clear the lower bowel so images are clearer and insertion is more comfortable. Tell your provider about all blood thinners, diabetes medications, and any allergies (especially to latex or antibiotics) so your preparation can be adjusted safely.

What to expect during the exam

You will typically lie on your side with your knees gently bent toward your chest while the technologist or doctor performs the exam in a private setting. A thin, covered, lubricated probe is then placed into the rectum; most patients feel pressure or mild discomfort, but the procedure itself usually takes only 5–15 minutes.

After the procedure and recovery

Most patients can return to normal light activity shortly after the test, though you may feel mild rectal soreness or a sense of fullness for a short time.

Benefits of TRUS

TRUS provides detailed, real‑time imaging without ionizing radiation, helping your provider evaluate prostate size, structure, and suspicious areas safely. It also improves accuracy when guiding biopsies, which can lead to more precise diagnosis and treatment planning.
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When to contact your provider

Contact your provider or seek urgent care if you develop fever or chills, cannot pass urine, or notice heavy or persistent bleeding after the exam. Your prostate specialist or referring doctor will discuss any next steps, such as follow‑up imaging, repeat PSA testing, or further treatment options.