A Pap test is a simple, relatively inexpensive procedure that can easily detect cancerous or precancerous conditions. Update Date: 06/10/2008James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.