胸膜积液可分为渗出性和漏出性。渗出性胸膜积液伴有胸膜病变而漏出液则无胸膜病变。通常认为,100毫升胸水中蛋白含量超过了3克为渗出性,低于2.5克为漏出性。胸水的比重和蛋白含量密切相关,比重在1.016即相当于胸水中蛋白量为3克%,每增减1克,比重即增减0.003。但目前认为并不能依赖 Pleural effusion can be divided into exudation and leakage. Exudative pleural effusion with pleural disease and leakage of fluid without pleural disease. It is generally believed that 100 ml of pleural fluid protein content exceeded 3 grams of exudative, less than 2.5 grams of leakage. Pleural effusion is closely related to the proportion and protein content, the proportion of 1.016 that is equivalent to pleural fluid protein content of 3 grams%, each increase or decrease 1 gram, the proportion of increase or decrease 0.003. But I do not think so