Abstract
A clomiphene citrate (CC) challenge test was carried out in 114 patients to evaluate the capacity of this test to predict the patient's individual response to controlled ovarian hyperstimulation (COH) performed with a gonadotropin-releasing hormone agonist and human menopausal gonadotrophins (hMG) for in vitro fertilization. The sum of follicle-stimulating hormone measured before and after CC intake, is the parameter that correlated best with subsequent response to COH. The upper limit of the reference value for this parameter, established by considering the CC challenge test performed on 26 patients who became pregnant, was 26.03 mIU/mL. Twenty patients who presented a CC challenge test result above the reference value were compared with patients with a normal test result. For these 20 patients, COH required more hMG and was cancelled in 25% of the cases (instead of 1% in the control group). The number of follicles aspirated, oocytes retrieved, and embryos obtained were on average six times lower than in patients with a CC challenge test result within the reference value, and no pregnancy was obtained. We concluded that CC challenge test provides a reliable individual prognosis for the ovarian response to COH.
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