ERA: it is a biopsy of an endometrium followed by finding out a genetic expression of an endometrium to find out the endometrium is
Pre receptive: required more days to transfer
Receptive: Require same days to transfer
Post receptive: require less days to transfer
It decides exact timing for embryo implantation
Still not recommend to all IVF failure. But at WINGS we are doing in selected IVF failure patient.