Low-Density Lipoprotein(LDL) Determination Reagent is an in vitro diagnostic quantitative test kit. LDL cholesterol measurement, in conjunction with other lipid measurements, has been shown to be useful in assessing the risk of coronary heart disease (CHD). The National Cholesterol Education Program (NCEP) has stated that LDL cholesterol should be the “key index” in determination of CHD risk.