Lactate dehydrogenase (LDH) levels rise primarily due to which process?

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LDH is a cytosolic enzyme found in many tissues, so a rise in serum LDH mainly reflects cellular injury and death. When cells are damaged or lyse, their membranes release LDH into the bloodstream, making elevated levels a marker of tissue injury. Dehydration can slightly affect concentration measurements but does not cause the enzyme to be released from cells. Vitamin deficiencies don’t cause LDH release through cell lysis, and while liver injury can raise LDH, the underlying mechanism is still cell damage releasing the enzyme. In short, the primary process driving the rise is cellular damage leading to LDH leakage into the blood; LDH elevations are nonspecific and can come from many tissues.