The length of life after kidney necrosis has a lot to do with the extent of kidney necrosis. If only one kidney is necrotic or a part of one kidney is necrotic, while the other kidney is normal, this situation does not affect the patient’s life expectancy, because normally one kidney can do the work of two kidneys. This is the reason why patients with uremia have a kidney transplant and survive for a long time with the help of one kidney. If both kidneys are necrotic and have completely lost the ability to detoxify and drain, it is equivalent to entering the uremic phase, which requires long-term survival with the help of hemodialysis, then the survival time may be between 10 and 20 years, and the better ones can reach more than 20 years. Besides, it is necessary to actively search for the cause of renal necrosis, because the underlying cause of renal necrosis may cause fatal damage to the body and even lead to sudden death.