Embryo transfer duration and IVF success

Difficult ET is associated with impaired implantation 3 probably due to endometrial damage , presence of blood in the catheter 5, and triggering of uterine contractions due to cervical manipulation. There is hardly any literature on the effect of time employed for performing ET on the success rates of IVF cycles. Logically, the time employed for performing ET may be an important prognostic factor for implantation and pregnancy rates since external factors like changes in environment, temperature, exposure to light, composition of catheter and embryo handling may have detrimental effects on the survival and growth of the embryo.