推荐回答（1个）
什么是乳酸脱氢酶（LDH：Lactic Dehydrogenase ）？
有时肝脏科医生要给肝病患者测定LDH．
LDH-乳酸脱氢酶是糖酵解过程中一种重要的酶，任何原因引起的肝细胞损伤均可因LDH逸出，引起血清LDH活力增加．急性肝炎或慢性肝炎活动期LDH常显著或中度增加，其临床意义大致与ALT、AST一致，但有人认为LDH反映肝细胞损害的灵敏度略逊于ALT．从发病到肝炎恢复期，LDH为最早恢复的酶．如果在疾病后期，病人未进行剧烈体力活动而LDH进行性升高或反复波动，常提示有某种并发症存在．故反复，定期，固定测定LDH有助于观察病情．特别是肿瘤组织中糖酵解速度明显高于正常组织，故肝癌时血清LDH活力明显升高．在肝硬化患者，如在病程中发现LDH增加，应疑及并发肝癌，再结合AFP，图像，穿刺可以早期判断病变．
但是血清LDH测定对肝病缺乏特异性，当含有LDH的心肌、肾、血细胞和肠等组织损伤时，LDH也会升高，如见于心肌梗塞、肺梗塞、进行性肌营养不良、肌炎、溶血性贫血、恶性贫血、白血病、肝以外恶性肿瘤等，这时结合其它指标可排除／考虑病因．
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