PCOS is defined as the presence of polycystic ovaries, described as enlarged under US with more than 10 cysts (2 and 8 mm) in mean diameter and symptoms of oligomenorhrea/ amenorhea, high LH/FSH ratio, obesity, hyperandrogenism hirsuitism and acnes), and withdrawal bleeding after administration of progesterone. All women had either failed to ovulate after receiving a maximum daily dosage of 100-150 mg of clomiphene citrate for 5 days or failed to conceive after at least three ovulatory cycles using CC or gonadotropin treatment. Other inclusion criteria included: patients between 30 and 36 years old with patent fallopian tubes, no previous IVF attempts, and nortmo-spermic partners.