A 24h urine volume of 4000ml in chronic renal failure is not normal and is polyuria.
Daily urine volume greater than 2500ml is called polyuria, therefore, it is not normal for patients with chronic renal failure to have a 24h urine volume of 4000ml. In addition, due to the decline of renal filtration function, patients with chronic renal failure usually have normal or reduced urine output, and usually do not have polyuria.
If patients with chronic renal failure have polyuria, it may be caused by excessive water intake, combined with other diseases, such as diabetes mellitus patients with high blood glucose leading to elevated urinary glucose, caused by solute diuresis, or the application of diuretics, combined with renal uremic syndrome.
If patients with chronic renal failure have polyuria, it is recommended to go to the regular hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.