In addition to a physical examination, the following tests may be used to diagnose cervical cancer: Pap test. The doctor gently scrapes the outside of the cervix and vagina taking samples of the cells for testing. Improved Pap test methods have made it easier for doctors to find cancerous cells.f a biopsy is not possible, the doctor may suggest other tests that will help make a diagnosis. Imaging tests may be used to find out whether the cancer has spread. This list describes options for diagnosing this type of cancer, and not all tests listed will be used for every person.