A colposcopy is a simple procedure that allows your doctor to examine your cervix more closely. It is performed in our office and takes 10 to 15 minutes. During a colposcopy, acetic acid (vinegar) is applied to your cervix and a doctor examines your cervix with a large microscope called a colposcope. The acetic acid causes any abnormal areas to turn white. Your doctor may choose to biopsy these areas, or take a small sample of cells for further testing. Some women may experience mild pain or discomfort as a result of a cervical biopsy.