Urine routine is able to detect nephritis. The main clinical manifestations of nephritis are hematuria, proteinuria, edema and hypertension, sometimes accompanied by renal insufficiency. Routine urine can detect hematuria and proteinuria. Most of the hematuria mentioned here refers to microscopic hematuria, that is, a count of more than 3 red blood cells per high-powered field of view can be seen in routine urinalysis. A small percentage of patients may show hematuria in the naked eye, where hematuria refers to polymorphic hematuria rather than homogeneous hematuria. Therefore, in addition to routine urinalysis, a urine sedimentation test should also be done. In addition, urine protein can also be seen in the routine urine examination, and urine protein is generally more common between 1-3 plus signs. Patients with nephritis are usually diagnosed with chronic nephritis when urine protein or polymorphic urine occult blood is found for more than 3 months.