Campesterol, Plasma analysis by Gas Chromatography–Mass Spectrometry (GC-MS) is a laboratory test that measures levels of campesterol, a type of plant sterol. Campesterol is considered an important indicator of plant-based food intake, and this analysis helps evaluate dietary patterns and monitor cholesterol levels in the body. It is particularly used to identify conditions associated with hypercholesterolemia and to guide nutritional and treatment strategies. By analyzing campesterol levels, physicians can gain valuable insights into cardiovascular health and provide appropriate counseling for patients.