Nephrotic syndrome is a general term for a group of clinical symptoms. Its primary diagnostic criteria include a 24-hour urine protein quantification of greater than or equal to 3.5 grams and plasma albumin less than or equal to 30 grams per liter; these two criteria are essential for the diagnosis of nephrotic syndrome. Meeting these criteria is sufficient for the diagnosis. There are also two additional supporting diagnostic criteria for nephrotic syndrome, which include possible symptoms of edema and hyperlipidemia. These four elements are the main clinical manifestations and diagnostic criteria of nephrotic syndrome.