The Stimulation step in IVF treatment ensures availability of multiple embryos for implantation in surrogate or traditional carrier.
The availability of multiple good embryos permits grading and selection to choose the best embryo available for the transfer.
The success of IVF is determined by the implantation rate which measures the proportion of transferred embryos that actually implant in the uterine lining and continue to develop till fetal heartbeat is detected.The implantation rate is best interpreted as the ratio of fetal hearts to transferred embryos.
The double embryo transfer is normally done to reduce or eliminate the risk of wastage of embryos.The process is carried out based on assumption that greater the larger the number of embryos implanted, the higher the chance of obtaining a pregnancy.
However, larger the number of embryos implanted in IVF treatment, the risk of multiple embryo implanting and pregnancy risk associated with surrogate mother and unborn babies increases.
The research studies conclude that multiple births, premature birth and low birth weight increases with the number of embryos implanted during an IVF procedure.Twin pregnancies are delivered 3-4 weeks earlier than a singleton pregnancy but are considered safe.
Hence, we advise to go for fetal reduction procedure in case of more than two embryos implanted.