Usually, it can be determined whether the transplanted kidney has slow drainage reaction based on clinical symptoms or ultrasound or pathological examination. If kidney transplant patients experience decreased urination, weight gain, rising creatinine, rising blood pressure, etc. after surgery, there is a possibility of slow rejection reaction, and they should go to the hospital for ultrasound or pathology examination in time to make a clear diagnosis. Chronic rejection of kidney transplantation mostly occurs about two months after the operation, at this time, if there is a decrease in urination, weight gain, proteinuria, high blood pressure, peripheral fatigue and so on, it should be paid attention to, and you can go to the hospital for blood sampling to check the index of creatinine, and if there is a rise in creatinine, it is possible that there is a slow drainage reaction, and renal ultrasonography and pathological examination can be carried out to make a clear diagnosis if necessary. If the clinical symptoms of chronic rejection of transplanted kidneys appear, you should go to the hospital in time to improve the examination and make a clear diagnosis, so as to carry out the targeted treatment as soon as possible, in order to prevent the aggravation of chronic rejection of transplanted kidneys, which may cause danger.