Correlation of computerized semen analysis with successful fertilization of oocytes in an in vitro fertilization program.

Sixty-nine couples enrolled in 123 in vitro fertilization-embryo transfer cycles were categorized by percentage fertilization; the results of categorization were compared with those of computerized semen analysis carried out with the CellSoft semen analyzer. Four groups were established: group 1 had 75% fertilization or greater; group 2 had 34% to 74% fertilization; group 3 had 1% to 33% fertilization; and group 4 had 0% fertilization. Statistical differences in certain semen parameters (motility, linearity, and straight-line velocity) were found comparing groups 1 and 3 using the initial ejaculate. A significant number of patients in group 1 had all normal semen parameters, but no statistical difference could be found in group 3 or 4 because of variations in specific abnormal parameters in the groups. When the straight-line velocity-motile density (SLVMD) calculation was used, a significant difference was seen between group 1 and group 3 and between group 1 and group 4 (p less than 0.01); 65% of group 3 and 76% of group 4 had an abnormal SLVMD. SLVMD is a useful calculation to predict fertilization rates in vitro from the initial ejaculate.