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The purpose of this study was to compare the efficacy of two recombinant FSH on pregnancy rates in infertile patients. Material and Methods: between 2015-2017, 387 females intended to have in vitro fertilization (IVF) for infertility treatment (226 patients use Gonal-F and 161 using Puregon. Results: Serum E2 concentration at hCG time was higher with Follitropin-a treated patients, and a larger number of retrieved oocyte result in a large number of the transferred embryo, and high pregnancy rate than Follitropin-b treated patients. Conclusions: Gonal-F (Follitropin-a) is associated with a potential stimulatory effect on ovaries. Puregon (Follitropin-b) was associated with a lower clinical pregnancy rate (PR). E2 level 5-7 days after stimulation can be used as an indicator of the success of IVF.
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