LDH stands for lactate dehydrogenase, an enzyme found in nearly all body tissues. It plays a crucial role in converting sugar into energy during the process of glycolysis. LDH is particularly important in the metabolism of glucose and is involved in the conversion of pyruvate to lactate when oxygen levels are low. LDH exists in different forms, known as isoenzymes, which are found in various tissues such as the heart, liver, and muscles. Measuring LDH levels in the blood can help diagnose conditions like heart attacks, liver disease, and certain types of cancer, as elevated levels may indicate tissue damage or disease.