Proteinuria is one of the most common clinical manifestations of urinary system diseases and one of the earliest indicators. There is a small amount of protein in the urine of normal people, the content of which is not more than 200 mg /24 hours, so the qualitative method of general urine protein can not be detected. When urine protein is larger than 200 mg /24 hours, it is called albuminuria.
Proteinuria is the most common form of glomerulonephritis, and proteinuria occurs in most nephritis. Therefore, urine protein show positive, people generally think of is glomerular disease. But in fact, not all proteinuria is caused by glomerulopathy, and proteinuria can also occur in many other cases, including urinary tract infections.
Urinary tract infection occurs proteinuria is often seen, but this time proteinuria has its own characteristics. In acute urinary tract infection, there is a small amount or a small amount of protein in the urine, which belongs to mucus protein, and the urine protein is within (+). Proteinuria increases in chronic pyelonephritis, but 24 hours urine protein is still within 1 grams. It is worth noting that the reflux nephropathy patients caused by secondary focal glomerulosclerosis and urinary tract infection in a handful of urinary tract infection, can appear proteinuria (more than 3.5 grams of /24 hours), and may lead to nephrotic syndrome, often with primary glomerular disease is not easy to do, needs to be confirmed kidney biopsy.