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To compare the effect of the different protocols in patients receiving in vitro fertilization treatment due to poor ovarian response. Seventy-seven of the patients included in the study were treated with gonadotropin (450 IU) + GnRH antagonist (group 1), 84 of the patients were treated with gonadotropin (450 IU) + microdose GnRH analog (group 2), and 53 of the patients were treated with clomiphene citrate (100 mg/day) + gonadotropin (300 IU) + GnRH antagonist (Group 3). In assessing total gonadotropin dosage, patients in Group 3 detected significantly less gonadotropin as compared to the other two groups (p < .001). Group 1 were superior to the other two groups with respect to retrieved oocytes, meiosis II oocytes and number of embryos obtained at the end of the treatment. As for the evaluation of clinical pregnancy, although the highest pregnancy rate was in Group 3, this finding was not of statistical significance. Although increasing the dosage of gonadotropins for ovarian hyper stimulation treatment in patients with poor ovarian response is beneficial with respect to retrieved oocytes, meiosis II oocytes and number of embryos, the increased dosage does not provide a statistically significant increase in clinical pregnancy rates. [ABSTRACT FROM AUTHOR]