ERA (endometrial receptivity assay) for those who aren't familiar is a tool designed to determine the best time of the cycle to transfer a frozen embryo after IVF. The studies on ERA have sown benefit in some patients if they have had multiple failed embryo transfers. In my clinic, I specialize in PGT single embryo transfers. Our current pregnancy rate using PGT is >85% per embryo transfer and as such I haven't found much of an improvement using ERA for my patients. I would recommend anyone considering having an ERA, ask your clinic how much of an improvement they have seen using the ERA so you can make the most informed decision.