LDH is used in medicinal use as a marker of tissue breakdown and can function as a marker for hemolysis. It can be used as a marker for myocardial infarction, more commonly known as heart attacks. Following a myocardial infarction, levels of LDH peak at three to four days, and remain elevated for up to ten days. In this way, elevated levels of LDH can be useful for determining if a patient has had a myocardial infarction, if they came to a doctor several days after an episode of chest pain. So the presence of elevated levels of LDH can be of great assistance in locating damaged tissue, particularly that of the cardiovascular system.