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Prostate biopsy

A prostate biopsy is the removal of tiny samples of prostate tissue to examine it for signs of prostate cancer.

The prostate is a small, walnut-sized gland just under the bladder. It wraps around the urethra, the tube that carries urine out of the body. The prostate makes semen, the fluid that carries sperm.

How the Test is Performed

There are three main ways to perform a prostate biopsy.

Transrectal prostate biopsy - through the rectum. This is the most common method.

  • You will be asked to lie still on your left side with your knees bent.
  • The health care provider will insert a finger-sized ultrasound probe into your rectum. You may feel a little discomfort or pressure.
  • The ultrasound allows the provider to see images of the prostate. Using these images, the provider will inject a numbing medicine around the prostate.
  • Then, using ultrasound to guide the biopsy needle, the provider will insert the needle into the prostate to take a sample. This may cause a brief stinging sensation.
  • About 10 to 18 samples will be taken. They will be sent to the lab for examination.
  • The entire procedure will take about 10 minutes.

Other prostate biopsy methods are used, but not very often. These include:

Transurethral - through the urethra.

  • You will receive medicine to make you sleepy so you do not feel pain.
  • A flexible tube with a camera on the end (cystoscope) is inserted through the opening of the urethra at the tip of the penis.
  • Tissue samples are gathered from the prostate through the scope.

Perineal - through perineum (the skin between the anus and the scrotum).

  • You will receive medicine to make you sleepy so you do not feel pain.
  • A small cut is made in the perineum.
  • A needle is inserted to collect prostate tissue.

How to Prepare for the Test

Your health care provider will inform you about the risks and benefits of the biopsy. You may have to sign a consent form.

Several days before the biopsy, your provider may tell you to stop taking any:

  • Anticoagulants (blood thinning drugs) such as warfarin, clopidogrel, or aspirin
  • Nonsteroidal anti-inflammatory drugs (NSAIDs), such as aspirin and ibuprofen
  • Herbal supplements
  • Vitamins

Continue to take any prescription medicines unless your provider tells you not to take them.

Your provider may ask you to:

  • Eat only light meals the day before the biopsy.
  • Do an enema at home before the procedure to cleanse your rectum.
  • Take antibiotics the day before or on the day of your biopsy.

How the Test will Feel

During the procedure you may feel:

  • Mild discomfort while the probe is inserted
  • A brief sting when a sample is taken with the biopsy needle

After the procedure, you may have:

  • Soreness in your rectum
  • Small amounts of blood in your stools, urine, or semen
  • Light bleeding from your rectum

To prevent infection after the biopsy, your provider may prescribe antibiotics to take for several days after the procedure. Be sure you take the full dose as directed.

Why the Test is Performed

A biopsy is done to check for prostate cancer or to find the cause of an enlarged prostate.

Your provider may recommend a prostate biopsy if:

  • A blood test shows that you have a higher than normal prostate specific antigen (PSA) level
  • Your provider discovers a lump or abnormality in your prostate during a digital rectal exam

Normal Results

Normal results from the biopsy suggest that no cancer cells have been found.

What Abnormal Results Mean

A positive biopsy result means that cancer cells have been found. The lab will give the cells a grade called a Gleason score. This helps predict how fast the cancer will grow. Your doctor will talk to you about your treatment options.

The biopsy also may show cells that look abnormal, but may or may not be cancer. Your provider will talk with you about what steps to take. You may need another biopsy.

Risks

A prostate biopsy is generally safe. Risks include:

  • Infection
  • Trouble passing urine
  • Allergic reaction to medicines
  • Bleeding or bruising at the biopsy site

Alternative Names

Prostate gland biopsy; Transrectal prostate biopsy; Fine needle biopsy of the prostate; Core biopsy of the prostate; Targeted prostate biopsy; Prostate biopsy - transrectal ultrasound (TRUS); Stereotactic transperineal prostate biopsy (STPB)

References

Aliotta PJ, Fowler GC. Prostate and seminal vesicle ultrasonography and biopsy. In: Pfenninger JL, Fowler GC, eds. Pfenninger and Fowler's Procedures for Primary Care. 3rd ed. Philadelphia, PA: Elsevier Mosby; 2011:chap 121.

American Cancer Society. How Is Prostate Cancer Diagnosed? Updated 3/12/21015. http://www.cancer.org/cancer/prostatecancer/detailedguide/prostate-cancer-diagnosis.Accessed 9/1/2015.American Cancer Society. How Is Prostate Cancer Diagnosed? Updated 3/12/21015. http://www.cancer.org/cancer/prostatecancer/detailedguide/prostate-cancer-diagnosis. Accessed 9/1/2015.

Trabulsi EJ, Halpern EJ, Gomella LG. Ultrasonography and biopsy of the prostate. In: Wein AJ, Kavoussi LR, Novick AC, Partin AW, Peters CA. Campbell-Walsh Urology. 10th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 97.

Review Date 9/15/2015

Updated by: Jennifer Sobol, DO, Urologist with the Michigan Institute of Urology, West Bloomfield, MI. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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