The study included 154 infertile women Patients received 100 mg of oral clomiphene citrate for five days starting on day 3 of the menstrual cycle, followed by daily injection of 150 IU of hMG and when more than two dominant follicles reached a diameter of 17 mm 5,000 IU of hCG was injected intramuscularly. Patients were randomly allocated into two equal groups: Group C received IUI without ESI and Group S had ESI using No.8 neonatal feeding tube and after 24 to 36 hours, IUI was performed. Successful pregnancy was con-firmed by ultrasound and patients had failed trial underwent another trial of IUI for a maximum of three trials.

The study included 154 infertile women with mean duration of infertility of 3.9±0.4 years. Patients received 100 mg of oral clomiphene citrate for five days starting on day 3 of the menstrual cycle, followed by daily injection of 150 IU of hMG and when more than two dominant follicles reached a diameter of 17 mm 5,000 IU of hCG was injected intramuscularly. Patients were randomly allocated into two equal groups: Group C received IUI without ESI and Group S had ESI using No.8 neonatal feeding tube and after 24 to 36 hours, IUI was performed. Successful pregnancy was con-firmed by ultrasound and patients had failed trial underwent another trial of IUI for a maximum of three trials.

Inclusion Criteria:

1. Couple with unexplained infertility and assigned for IUI

Exclusion Criteria:

1. Woman's age of more than 40 years
2. Ovarian cyst detected in the ultrasound examination
3. Uterine lesions such as submucosal leiomyoma
4. A previous diagnosis of moderate to severe pelvic endometriosis
5. Women with body mass index ≥35 kg/m2 o
6. Women with signs of hyperandrogenemia dy