What is Pap smear or Pap test? This test is used to screen women for cervical cancer. The test is reliable for detecting early abnormal cell changes that would cause cancer of the cervix. This test is recommended for women between the ages of 18 to 65. How it is done? It is done in your doctor’s clinic by acquiring a small sample of cells from the surface of the cervix. Your doctor will then spread the sample on a slide and sent to a lab for examination under a microscope.