胸膜积液在多种病情下均可发生,约20%患者很难判断其发病原因。Light 等人的研究指出,胸液乳酸脱氢酶(PLDH)≥200IU,胸液乳酸脱氢酶和血清乳酸脱氢酶比(P/S LDH)≥0.6,胸液蛋白与血清蛋白比(P/S PROT)≥0.5;而漏出液则不具备此类特点。近期研究发现胸膜胆固醇水平(PCHOL)可反映胸膜积液的病因。作者通过分析 PCHOL 以及胸膜 Pleural effusion can occur in a variety of conditions, about 20% of patients is difficult to determine the cause of the disease. The study by Light et al. Showed that the ratio of pleural fluid lactate dehydrogenase (PLDH) ≥ 200 IU, pleural fluid lactate dehydrogenase and serum lactate dehydrogenase ratio (P / S LDH) ≥ 0.6, pleural fluid protein to serum protein ratio / S PROT) ≥0.5; while the leakage of liquid does not have such characteristics. Recent studies have found that pleural cholesterol levels (PCHOL) can reflect the cause of pleural effusion. The authors analyzed PCHOL and pleura