الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Infertility prevalence, as one of the main problems in the society, is 15% that may threaten the continuity of life. In Iranian population, primary and secondary infertility are 79% and 21% respectively. Frozen-thawed embryo transfer (FET) versus fresh embryo transfer (ET) is being performed mostly worldwide.
Embryos can be cryopreserved at any stage, from zygote to blastocyst, and remain viable for at least several years. In fresh cycles, the endometrium is artificially primed and the embryos could be cryopreserved and used in next cycles when the detrimental effects of high dose of hormones during controlled ovarian hyperstimulation (COH) are disappeared.
Identically, in frozen-thawed embryo transfers, endometrial priming may be achieved with the use of estrogen and progesterone.
Besides, infertility is a common problem of couples of reproductive age and it is observed in one of five infertile couples, FET has become an essential status of ART. This method enables the means to diminish the number of transferred embryos, also, contributes to reducing the risk of multiple pregnancies.
According to some studies, vitrification may increase the embryo survival rate and decrease the rate of cooling damage. In fresh ET, the uterine circumference after COH may also be less optimal for implantation.
This study aim to compare the difference between fresh embryo transfer and frozen-thawed embryo transfer regarding, clinical pregnancy rate and embryo grading.
This study was carried out in Elshatby Maternity Hospital and the integrated fertility Center of Alexandria, the data was collected from January 2014 till December 2016. The data was classified into two groups; Fresh embryo group which include 1051 cases, and frozen embryo group which include 215 cases.
In our study the results show that there was no significant difference between the two studied groups (Fresh and frozen) regarding basic characteristic feature, clinical data and demographic data.
It was found that in cleavage stage, there was a significant increase in number of embryo transferred in frozen more than fresh and the high grade embryos were significantly higher in frozen group more than fresh group but the clinical pregnancy show insignificant difference in the two groups. In the day 4 embryo transfer it was found that there was no significant difference between the two groups regarding embryo transfer, clinical pregnancy rate and embryo grade.
The results at blastocyst s