Endometrial cells are sometimes collected in a Pap test, according to the University of Chicago Medicine. Endometrial cells are found in the lining of the uterus. A Pap test is used to collect cells from the cervix and the vagina.
When cells are collected from a Pap test, they are placed under a microscope to check for any abnormalities, notes the University of Chicago Medicine. If there are abnormal cells from the lining of the uterus, the woman has follow-up tests to check for endometrial cancer. However, there are no good, specific tests for endometrial cancer, and the Pap test does not collect cells directly from that area.