An in vitro transfer lining of 14mm is a normal endometrial thickness, at which point a transplant can be performed. If you want to undergo IVF transplantation, you need to wait for the endometrium to reach a certain thickness before you can undergo the transplantation. Also, there are no other pathologies such as polyps, adhesions and various other conditions, and the transplant can only be performed when the body is normal. Generally, endometrial thickness between 8-14mm is suitable for transplantation and has a higher success rate. If the endometrial lining is thin or too thick, it will affect the normal conception and lead to various conditions such as IVF transplant failure. If you want to have IVF transplant, you can go to the hospital regularly to observe the endometrial thickness and follicle development, and choose the right time for transplantation according to your health condition, so that the success rate is higher.