Core needle biopsy

A core needle biopsy is a test to take samples of tissue using a needle with a special tip. The samples are looked at under a microscope to check for changes in the cells.

A core needle biopsy is done to check for cancer or other problems. It is often done to check a lump found during an exam. It's also done when an area of concern is found on a mammogram or other imaging. Sometimes the biopsy results help plan treatment.

• Depending on what part of your body is being tested, you may sit in a chair or lie on a table. After you are positioned, the doctor or nurse will clean and numb the area where the biopsy will be done. Or you may have intravenous (I.V.) sedation or general anesthesia, which will make you sleep.
• When the area where the doctor will do the biopsy is numb, a small cut (incision) may be made in the skin.
• The doctor may use ultrasound, an X-ray, a CT scan, or an MRI to help guide the placement of the biopsy needle.
• The doctor will take several samples. This may be done with the needle or with a probe that uses a gentle vacuum to remove the samples.
• A marker may be placed in the biopsy site. You won't be able to feel or see this marker after it is placed. But the marker will be visible in future imaging tests, such as mammograms, ultrasounds, and MRIs. This will help the doctor find the area later.
• The needle is removed, and pressure may be put on the needle site to stop any bleeding.
• A bandage may be put on the needle site.

If you take aspirin or some other blood thinner, ask your doctor if you should stop taking it before your test. Make sure that you understand exactly what your doctor wants you to do. In some cases, you may be asked to not eat or drink before your procedure.