Urinary protein is often weakly positive, and there are three possibilities for 24-hour urine protein quantitative examination to be normal: first, the routine urine specimen may be concentrated urine, second, the 24-hour urine volume is low, and third, the 24-hour urine retention measurement is wrong or the routine urine examination and the 24-hour urine protein quantitative examination are wrong.

Generally speaking, 24-hour urine protein quantification is the standard. In addition to routine urine examination and 24-hour urine protein quantification, patients with chronic nephritis can also check urine specific protein, and regularly draw blood to check renal function, blood pressure, blood lipid, blood sugar and renal color ultrasound.