Elevated serum levels of LDH have been observed in a variety of disease states. The highest levels are seen in patients with megaloblastic anemia, disseminated carcinoma, and shock. Moderate increases occur in muscular disorders, nephritic syndrome, and cirrhosis. Mild increases in LDH activity have been reported in cases of myocardial or pulmonary infarction, leukemia, hemolytic anemia, and nonviral hepatitis.2
Hemolysis elevates LDH results, oxalate inhibits LDH, and ascorbic acid can decrease LDH values.