CPT® Code 83718

The CPT® Code 83718 refers to a specific laboratory test that measures high-density lipoprotein (HDL) cholesterol levels in the blood. HDL cholesterol is a type of lipoprotein that plays a crucial role in the body's lipid metabolism. Lipoproteins are complex particles composed of lipids, such as cholesterol and triglycerides, bound to proteins. They are essential for transporting fats through the bloodstream. The size and density of lipoproteins can vary significantly; they can be classified as large and less dense, which contain more fat than protein, or small and more dense, which contain more protein than fat. Lipoproteins can originate from dietary sources, known as exogenous lipoproteins, or can be produced by the liver, referred to as endogenous lipoproteins. Among the various types of lipoproteins, low-density lipoproteins (LDL) are particularly noteworthy due to their association with cardiovascular disease (CVD). LDL particles can vary in size and density, with small dense LDL (sdLDL) being particularly harmful as it is more likely to contribute to atherosclerosis, a condition characterized by the buildup of fatty deposits in the arteries. In contrast, HDL cholesterol is often termed "good" cholesterol because it helps to remove excess cholesterol from the bloodstream, thereby reducing the risk of atherosclerosis and CVD. The direct measurement of HDL cholesterol, as indicated by CPT® Code 83718, is performed using a specific laboratory test that employs detergent solubilization and enzymatic methodologies. This method provides a more accurate assessment of HDL levels compared to calculations based on total cholesterol, HDL, and triglycerides. A blood sample for this test is obtained through venipuncture, which is a separate and reportable procedure. Understanding HDL cholesterol levels is vital for evaluating cardiovascular health and guiding treatment decisions.