CPT® Code 83625

The CPT® Code 83625 refers to the laboratory test for lactate dehydrogenase (LD) isoenzymes, specifically focusing on their separation and quantitation. Lactate dehydrogenase (LDH) is an important enzyme that plays a critical role in the metabolic process, particularly in the conversion of lactate to pyruvate. This enzyme is found in various tissues throughout the body, including red blood cells (RBCs), heart, liver, pancreas, kidneys, skeletal muscle, brain, and lungs. The presence of LDH in these tissues means that it can serve as a valuable biomarker for tissue damage or disease. LDH exists in five distinct isoenzymes, each with a unique structure and distribution across different organs. These isoenzymes are categorized as LDH-1, LDH-2, LDH-3, LDH-4, and LDH-5. LDH-1 is predominantly located in heart muscle and red blood cells, making it particularly relevant in diagnosing cardiac conditions. LDH-2 is primarily found in white blood cells, while LDH-3 is associated with lung tissue. LDH-4 is present in the kidney, placenta, and pancreas, and LDH-5 is mainly found in the liver and skeletal muscle. By measuring the levels of these specific LDH isoenzymes, healthcare providers can gain insights into the location and extent of tissue damage, which can aid in diagnosing various medical conditions. The test is performed by obtaining a blood sample through venipuncture, and the serum is then analyzed using quantitative enzymatic methodology and electrophoresis to separate and quantify each isoenzyme individually.