Background & Objectives: Infertility affects approximately 10-15% of reproductive age couples. Intra Uterin Insemination (IUI) is a primary, simple and effective method of infertility treatment in ovulatory disorders, unexplained infertility, cervical factors and some cases of male factor. In this research, the success rate of IUI with regard to different causes of infertility was studied in Kowsar IVF centre.

  Methods: In this retrospective study, 404 infertile couples were studied using a questionnaire that included the demographic data, duration of infertility , sperm count and mobility, follicular diameter and count, situation of uterus and fallopian tubes and pregnancy results. The data were analyzed with SPSS.

  Results: Pregnancy rate was 11.1% for patients with ovulatory factors and 7.1% for male factors. There were no significant differences in sperm count and diameter of follicles in pregnant and nonpregnant women.

  Conclusion: With regard to different causes of infertility the best treatment results were achieved by IUI in ovarian factor. Patients over 35-40 did not have a good prognosis in COH-IUI cycles. Other methods of ART are recommended in such cases.