What does LDH stand for?

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LDH stands for lactate dehydrogenase. This enzyme catalyzes the reversible conversion between lactate and pyruvate using NAD+/NADH, linking glycolysis with other metabolic pathways like gluconeogenesis in the liver. The term uses lactate (the ionized form at physiological pH) rather than lactic acid, which is why the correct name is lactate dehydrogenase. Clinically, LDH has multiple isoenzymes distributed across tissues, so elevated LDH can indicate tissue damage in various organs, not just the liver. The other options refer to different enzymes (lipase acts on fats; leucine dehydrogenase isn’t a standard enzyme name) or use an outdated naming variant, which is why they aren’t correct.