Lactate dehydrogenase is found in five different forms or isoenzymes named LD-1 to LD-5. These isoenzymes are found in abundance in the different organs of the body as follows:
· LD-1: heart, red blood cells, kidneys, germ cells (testes and ovaries)
· LD-2: heart, red blood cells, kidneys
· LD-3: lungs and other tissues
· LD-4: white blood cells, lymph nodes, muscles, liver
· LD-5: liver, skeletal muscle
If the results of the total Lactate Dehydrogenase Test display elevated levels, tests for the different isoenzymes may be performed to indicate the exact location of the body where tissue damage has taken place.