LDH testing is most commonly used to detect which condition?

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LDH is a marker of cellular injury: when cells are damaged, they release LDH into the bloodstream. In myocardial infarction, heart muscle cells die and release LDH, so elevated LDH has historically helped indicate myocardial injury. While troponin is now the preferred, more specific marker for heart damage, LDH elevations were classically associated with an MI and could show a characteristic pattern of LDH isoenzymes. Among the options, myocardial infarction is the condition most consistently linked to LDH testing. Other conditions can raise LDH nonspecifically (lung issues, liver disease, hemolysis), but they are not the classic or most diagnostic context for LDH elevation.