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A Lactic dehydrogenase (LDH) blood test is a test that measures the level of LDH enzymes in the blood. LDH enzymes are found in many tissues in the body, including the liver, heart, muscles, and red blood cells. An LDH test is often used to help diagnose conditions that may be causing damage to these tissues, such as a heart attack, liver disease, or muscle injury. Other names for this test include LD test and lactic acid dehydrogenase.
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