Abstract Lactate dehydrogenase (LDH), a ubiquitous enzyme present in human tissues and body fluids, catalyzes the reversible oxidation of lactate to pyruvate. Electrophoretically, LDH can be separated into five distinct isozyme fractions commonly designated as LDH-1, LDH-2, LDH-3, LDH-4, and LDH-5 [1].