Prognostic Factors to Achieve Higher Pregnancy and Live Birth Rate in Intrauterine Insemination Among Subfertile Women

Background: The purpose of this study was to evaluate the prognostic factors that could affect the clinical pregnancy rate (CPR) and live birth rate (LBR) among subfertile women undergoing intrauterine insemination (IUI). Methods: A retrospective analysis study of a total of 2186 cycles of IUI among 1784 subfertile women between 2012 and 2017 at the infertility clinic in Taipei Medical University Hospital was conducted. Social demographics, CPR, and LBR were measured. Eleven prognostic factors were analysed with multivariable logistic regression. Results: Of the 2186 cycles, 569 became pregnant (26.0%), resulting in 454 live births. The LBR per cycle and per patient were 20.8% and 24.6%, respectively. Eight factors were found to significantly predict the obstetric outcome among the women who underwent IUI (p [Formula: see text] 0.05). Age, [Formula: see text] 35.0 years old; serum anti-Müllerian hormone (AMH) level, [Formula: see text] 1.2 ng/mL; delayed sperm insemination, [Formula: see text] 36.0 hour following human chorionic gonadotropin (HCG) injection; serum estradiol level, [Formula: see text] 500 pg/mL; endometrial thickness, [Formula: see text] 7.0 mm on the day of HCG administration; and post-wash total motile sperm count (TMSC), [Formula: see text] 5 million/mL were found to be prognostic factors in determining the CPR and LBR (p [Formula: see text] 0.05). However, duration of subfertility and the presence of urine luteinizing hormone surge during the day of the HCG trigger inversely affected the LBR (p = 0.006 and p = 0.033, respectively) but not the CPR (p [Formula: see text] 0.05). The type of infertility, total antral follicle count, and pre-wash TMSC were not able to predict pregnancy outcome (p [Formula: see text] 0.05). Conclusions: Six out of 11 factors were identified as strong prognostic factors for successful pregnancies and live births: age, serum AMH and serum estradiol levels, endometrial thickness, post-wash TMSC, and delayed sperm insemination after HCG injection.