A diagnostic tool that precisely identifies a woman’s personalized window of implantation (WOI), a critical factor for successful embryo transfer and addressing recurrent implantation failure. This involves a quick endometrial biopsy to analyze 236 genes related to receptivity. Results classify the endometrium as Receptive (optimal WOI identified) or Non-Receptive (WOI displaced), guiding a personalized embryo transfer that significantly boosts pregnancy rates (up to 85%). It’s ideal for women facing implantation failures, those with normal uterine conditions but struggling to conceive, and individuals with limited embryos.