Superovulation will be conducted with 100 mg of oral clomiphene citrate (Clomifene; Young Poong Pharmaceutical, Incheon, Korea) for 5 days starting on day 3 of the menstrual cycle, followed by daily injection of 150 IU of human menopausal gonadotropin (hMG;Menogon; FerringPharamceutical Co, Germany). When more than 2 dominant follicles reached a diameter of 17 mm or the urinary specimen showed positive results for luteinizing hormone (LH) surge, 5000 IU of hCG (Pregnyl; Organon, Oss, the Netherlands) was injected intramuscularly.

Superovulation will conducted with 100 mg of oral clomiphene citrate (Clomifene; Young Poong Pharmaceutical, Incheon, Korea) for 5 days starting on day 3 of the menstrual cycle, followed by daily injection of 150 IU of human menopausal gonadotropin (hMG;Menogon; FerringPharamceutical Co, Germany). When more than 2 dominant follicles reached a diameter of 17 mm or the urinary specimen showed positive results for luteinizing hormone (LH) surge, 5000 IU of hCG (Pregnyl; Organon, Oss, the Netherlands) was injected intramuscularly. Successful pregnancy after IUI was confirmed by ultrasound as one or more visible gestational sacs in the uterine cavity.

Inclusion Criteria:

• These patients had at least 1 tube patent
• there were no significant intrauterine or pelvic abnormalities demonstrated on pelvic-abdominal ultrasonography, hysteroscopy, and/or laparoscopy
• serum follicular stimulating hormone (FSH) level of12 mIU/mL or less

Exclusion Criteria:

• A woman's age of more than 40 years,
• ovarian cyst detected in the ultrasound examination
• uterine lesions such as submucosal leiomyoma, and a previous diagnosis of moderate to severe pelvic endometriosis.
• women with body mass index > 35 kg/m2,
• PCOS/anovulatory patients
• signs of hyperandrogenemia