This test is similar to having a pap smear done, but requires a couple to have intercourse 2-8 hours beforehand. It is done at midcycle when the cervical mucous is thin and receptive to sperm. A small sample is removed, placed on a slide and examined with the microscope. If good, it suggests that the cervix is not a barrier to fertilization. If the test is poor, the couple may benefit from insemination. Once a common test, the PCT is done less commonly today.