No urine after 15 days of kidney transplantation is usually that the transplanted kidney does not play a role, which may be caused by acute rejection reaction, delayed recovery of transplanted kidney function, etc., and needs to be judged according to the specific circumstances. 1. Acute rejection reaction: acute rejection reaction is because after the allogeneic kidney transplantation into the body, the body’s immune system recognizes it as a foreign body and carries out immune defense, resulting in rejection reaction. After kidney transplantation, if acute rejection reaction occurs, symptoms such as pressure pain in kidney area, oliguria or anuria may appear. Glucocorticosteroids (e.g. prednisolone, etc.) can be taken to assist the treatment. 2. Delayed recovery of transplanted kidney function: During the period between the removal of the transplanted kidney from the donor’s body and transplantation into the recipient’s body, the kidney may show ischemic injury. This may lead to the phenomenon of oliguria or even anuria after the recipient receives renal suppression, which will usually be recovered through hemodialysis treatment for a period of time. If you have no urine after 15 days of kidney transplantation, you should consult a doctor in time to find out the cause and then treat it positively to avoid delaying your condition.