Reasons of IVF Implantation Failure
The main causes of IVF implantation failure can be summarized as: poor embryo quality or chromosomal abnormalities (the most common factor, accounting for 65–70%), an unfavorable uterine environment (such as polyps, septum, adhesions, fibroids, or thin endometrium), mismatched implantation timing (window of implantation issues), immune rejection, or coagulation abnormalities. Advanced maternal age, obesity, and psychological stress can also significantly reduce success rates.