Ans. is a i.e. Immunological defect Post coital test is a test for evaluation of the potential role of cervical factor in infeility. The couple is advised intercourse close to ovulation time, in the early hours of morning (preferably) The woman presents herself at the clinic within 2 hours after the intercourse. The mucus is aspirated from the cervical canal and posterior fornix (acts as control) and spread over a glass slide. Result : 10-50 motile Sperms with progressive movement/ HPF in cervical mucus seen Cervical factor ruled out Less than 10 sperms / HPF Need for proper semen analysis to see oligospermia Sperms immotile in mucus aspirated from cervical canal and motile in specimen from posterior fornix or Rotatory/ shaky movement seen in sperms aspirated from cervical canal Immunological defect