How you prepare

Before the breast biopsy, tell your doctor if you:

• Have any allergies
• Have taken aspirin in the last seven days
• Are taking blood-thinning medications
• Are not able to lie on your stomach for an extended period

If the breast biopsy will be done using an MRI, tell your doctor if you have a cardiac pacemaker or other electronic device implanted in your body. Also tell your doctor if you're pregnant or think you may be pregnant. An MRI generally isn't recommended in these situations.