CPT® Code 83722

The CPT® Code 83722 refers to a specific laboratory test that measures small dense low-density lipoprotein (sdLDL) cholesterol levels in the blood. Lipoproteins are complex biochemical structures composed of lipid molecules, which are fats, bound to proteins. These structures play a crucial role in transporting lipids throughout the body via the bloodstream. Lipoproteins can vary significantly in size and density; they range from large, less dense particles, which have a higher fat content relative to protein, to smaller, denser particles, where protein predominates. These lipoproteins can originate from dietary sources, known as exogenous lipoproteins, or can be produced internally by the liver, referred to as endogenous lipoproteins. Among the various subclasses of low-density lipoproteins (LDL), small dense LDL is particularly noteworthy due to its association with an increased risk of atherosclerosis, a condition characterized by the buildup of fatty deposits in the arteries. This subclass is considered a strong contributor to inflammatory processes linked to cardiovascular disease (CVD) and serves as a more reliable marker for predicting the risk of CVD compared to other LDL subclasses. In contrast, high-density lipoproteins (HDL) are beneficial as they assist in the removal of cholesterol from the bloodstream, thereby reducing the risk of atherosclerosis and CVD. The direct measurement of lipoproteins, such as small dense LDL cholesterol, is performed using specific laboratory tests rather than relying on calculated values derived from total cholesterol, HDL, and triglyceride levels. This direct measurement provides a more accurate assessment of lipoprotein levels. To obtain the necessary blood sample for this test, a venipuncture is performed, which is a separate and reportable procedure. The test for small dense LDL cholesterol (CPT® Code 83722) is distinct from other related tests, such as those for HDL (CPT® Code 83718), very low-density lipoproteins (CPT® Code 83719), and standard LDL cholesterol (CPT® Code 83721), each of which employs different methodologies for analysis.