OBJECTIVE: Optimized ovarian stimulation protocols are required for the success of in vitro fertilization (IVF). The purpose of this study was to estimate whether the ovarian reserve test using exogenous follicle-stimulating hormone (FSH) could predict ovarian response in IVF.METHODS: This was a prospective observational study of 110 patients who underwent their first IVF cycle. The FSH test was administered as 150 IU of urinary FSH daily from day 3 to day 6 of the menstrual cycle preceding the IVF cycle for evaluation of the plasma estradiol level. Outcomes of IVF, including ovarian response, were analyzed. RESULTS: A negative correlation was observed between the duration of stimulation and the result of the FSH test (r = -.238, P = .014) and between the dose of FSH per retrieved mature oocyte (metaphase II oocyte) and the result of the FSH test (r = -.308, P < .001). In addition, our results showed that the result of the FSH test was significantly lower in poor responders defined by FSH of 400 IU/metaphase II oocyte or greater (207 ±149 compared with 293 ±174 pg/mL, P =.007). CONCLUSION: The FSH test can be a useful tool for determining the conditions of individualized clinical management plans and optimizing stimulation protocols in IVF. OBJECTIVE: Optimized ovarian stimulation protocols are required for the success of in vitro fertilization (IVF). The purpose of this study was to assess whether the ovarian reserve test using exogenous follicle-stimulating hormone (FSH) could predict ovarian response in IVF. METHODS: The was a prospective observational study of 110 patients who underwent their first IVF cycle. The FSH test was administered as 150 IU of urinary FSH daily from day 3 to day 6 of the menstrual cycle preceding the IVF cycle for evaluation of the plasma estradiol level. RESULTS: A negative correlation was observed between the duration of stimulation and the result of the FSH test (r = -.238, P = .014) and between the dose of FSH per retrieved mature oocyte (metaphase II oocyte) and the result of the FSH test (r = -.308, P <.001). In addition, our results showed that the result of the FSH test was significantly lower in poor responders by FSH of 400 IU / metaphase II oocyte or greater (207 ± 149 compared with 293 ± 174 pg / mL, P = .007). CONCLUSION: The FSH test can be a useful tool for determining the conditions of individualized clinical management plans and optimizing stimulation protocols in IVF.