© Copyright 2026 American Medical Association. All rights reserved.
The CPT® Code 0111T refers to the measurement of long-chain (C20-22) omega-3 fatty acids, specifically eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), within the membranes of red blood cells (RBCs). These fatty acids are significant as they play a crucial role in cellular structure and function, influencing the fluidity, flexibility, and permeability of cell membranes. Additionally, they impact the activity of enzymes that are associated with these membranes. The accumulation of long-chain omega-3 fatty acids in RBC membranes serves as a biomarker for assessing cardiovascular disease risk, particularly the risk of sudden cardiac death. The presence of these fatty acids is known to modulate the excitability of cardiac muscle cells by regulating the flow of electrolytes through ion channels, which is vital for maintaining normal cardiac function. To obtain the necessary data, a blood sample is collected through a separate, reportable procedure. The analysis involves testing the whole blood for total fatty acids, including the long-chain omega-3 fatty acids, utilizing gas chromatography/mass spectrometry techniques. The results of this analysis are expressed as a percentage, which is subsequently calculated to evaluate the associated cardiac risk.
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