الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Since ART approaches have improved, embryo cryopreservation has become a crucial portion of IVF therapy (67)
Efficient approaches for cryopreservation of surplus embryos at the whole developmental stages are thus imperative to increase the cumulative PR between fresh and FET from single cycle oocyte retrieval. The traditional slow freezing is the classic standard approach of cryopreservation. Nevertheless , vitrification is an emerging technique for embryo cryopreservation validated by IVF centers globally (68).
There is marked advancement in cryopreservation culture procedures for embryos as the success of the 1st pregnancy obtained via FET in the 1983s. Such approach has been utilized as a supplement to IVF and ET. FET is adopted by every center and has become a crucial portion of IVF/ICSI therapy. Thus, the high rate of FET has elevated the awareness of the safety of the approach (69).
The current study was a prospective study including one hundred thirty cases, aimed at analyzing the obstetric outcomes in singleton pregnancy achieved following fresh ET versus FET. Cases were classified into 2 groups, the 1st included 67 cases who were subjected to fresh ET, whereas the 2nd group that included 63 cases who were subjected to FET.
In this study, regarding the baseline characteristics (age, the type of infertility, BMI, AMH and obstetric history) in both groups were matched.
Regarding the