IVF has become a last resort for many infertile couples and providing IVF success rates is of great concern to us. What factors can affect the success rate of IVF? 1. age is a very important factor affecting the success rate of IVF, with age, the number of eggs decreases, the quality decreases, and quality embryos cannot be formed, the pregnancy rate decreases significantly, and the miscarriage rate increases significantly. the success rate of IVF for women over 45 years old decreases significantly, below 5%, and the miscarriage rate is higher than 20%. 2. Endometrial lesions such as endometrial polyps, endometritis, uterine adhesions, endometrial hyperplasia, etc. can affect embryo implantation. 3. Tubal effusion Tubal effusion may flush and poison the embryo, significantly reducing the implantation rate and pregnancy rate. Therefore, it is recommended for women with fluid in the fallopian tubes to have the fluid-bearing side of the tubes removed before IVF. 4. Male sperm If the male partner has too much sperm DNA fragmentation, it may lead to abnormal fertilization and failure to form normal embryos; when azoospermic men have poor quality sperm obtained by testicular or epididymal puncture, the quality of embryos formed will also be relatively poor.