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The Pregnancy Outcomes of Day 2 versus Day 3 Embryo Transfer: A Cross-Sectional Study

Ashrafi Mahnaz نويسنده , Kiani Kiandokht نويسنده , Mirzaagha Elaheh نويسنده , Shabani Fatemeh نويسنده

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Background: The objective was to evalu ate whether extending the embryo culture period from 2 to 3 days would yield a more optim al selection of viable embryos, thereby increasing the pregnancy rate. Materials and Methods: We have retrospectively analyzed pregnancy rates in the patients who had embryo transfer either on day 2 (582 patients) or on day 3 (387 patients) post- insemin ation over a 10-month period. The relationsh ip between the quali ty score of day 2 and day 3 embryos and their respective pregnancy rates was also analyzed . Results: The demographic and clinical characteristics were similar in both groups. Embryos transferred on day 2 or day 3, were sim ilar morphologically& we found no difference in the distribution of grades between patients who became pregn ant and those who failed to become pregnant. Pregnancy rates were slightly higher in patients who had embryo transfer on day 3 (40.72 %) than patients who had transferred on day 2 (38.96 %), but this difference was not significant. proportion of embryos with 2-3 cells, four cells , and 5-7 cells, which selected for transfer, showed psirgenginfiacnatnatnddifnfeorne-npcreegbneatwnte-ewnodmaeyn2baansdeddaoyn3em(pb