Used to measure HMG-CoA reductase (HMGR) enzyme activity in human biological samples such as serum, plasma, or tissue extracts. This assay is commonly applied in research settings to study cholesterol metabolism, evaluate the effectiveness of statin drugs, and investigate metabolic disorders related to lipid regulation. The kit enables quantitative analysis, supporting studies in cardiovascular disease, diabetes, and drug development where HMGR activity serves as a key biomarker.