["To determine whether the pattern of the LH surge in a treatment cycle with artificial insemination with the husband's semen (AIH) because of cervical factor infertility is associated with the probability of conception.", 'Retrospective study.', 'University Hospital, Department of Obstetrics and Gynecology.', 'Couples with cervical factor infertility as the main cause of subfertility.', 'Luteinizing hormone monitored AIH.', 'Whether or not a pregnancy occurred after AIH.', 'There were 53 pregnancies in 382 IUI cycles (pregnancy rate [PR] per cycle: 13.9%). The PR was significantly higher in cycles with an LH surge of 2 days compared with cycles with a surge of 1 day. The probability of conception also seemed to be related to the height of the LH surge.'] Is the pattern of the luteinizing hormone surge in spontaneous cycles related to the probability of conception?