Elevated Serum Levels of LDH have been observes 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, renal diseases, and cirrhosis. Mild increases in LDH activity have been reported in cases of myocardial or pulmonary infarction, leukemia, hemolytic anemia, and nonviral hepatitis.