Medically Idh stands for Lactate dehydrogenase, a glycolytic enzyme present in the cytoplasm of cells in all tissues of our organism. Its indicator is commonly used to aid in the diagnosis of cardiovascular, liver and tumor diseases. Lactate dehydrogenase is widely found in all tissues and organs of the human body, and its main function is to catalyze the oxidation of lactic acid to pyruvic acid. Lactate dehydrogenase is released into the bloodstream either by normal cell secretion or by abnormal cell destruction. The amount of lactate dehydrogenase is abnormal when tissue and organs are diseased. Clinically, abnormally high levels of lactate dehydrogenase are often indicative of hematologic, cardiac, hepatobiliary, and malignant tumors. However, the specific situation should be further examined and clarified under the guidance of a doctor.