 In a core biopsy, a needle is passed through the skin to obtain a sample of tissue from a mass or lump. This sample is examined under a microscope for any abnormalities. Pre procedure, please inform your doctor if you are on blood thinners and make sure you are not on an empty stomach. You are settled comfortably in a private area throughout the procedure. The site of biopsy is exposed and the rest of your body is covered with a blanket. The doctor may administer local anesthesia. The procedure is done with an automated gun. The procedure takes about 20 minutes and you may experience slight discomfort. Post procedure, the site is disinfected and a Band-Aid is applied. Reports will be available within four days and can be collected from the oncology department.