Apolipoprotein B/Apolipoprotein A-1 ratio is an index reflecting the balance between atherogenic lipoprotein particles and anti-atherogenic lipoprotein particles. When this balance is disrupted, atherosclerosis progresses, leading to stroke. Additionally, the ApoB/ApoA-1 ratio is also a strong predictor of cardiovascular events such as myocardial infarction, angina, and heart failure, compared to conventional lipid tests like total cholesterol, triglycerides, LDL-cholesterol, and HDL-cholesterol.