Cholesterol exists in different forms and amounts that have a big impact on heart attack risk. It helps carry cholesterol out of the body, including cholesterol deposited inside blood vessels, where it may block the flow of blood. Those blockages in the coronary arteries, which supply blood to the heart's muscular walls, are the main cause of heart attacks. The American Heart Association says that actual total cholesterol and HDL readings are the best way to identify high-risk people. To find the ratio, divide HDL cholesterol into total cholesterol.
Lower ratios are healthier ratios.
It helps deposit cholesterol into blood vessels. In addition to cholesterol, blood tests usually measure triglycerides, which make up most of the body's fat. Common fats in the diet, including vegetable oils, margarine, and butter also are triglycerides. Experts are not sure how much triglycerides contribute to heart attack risk, but believe that lower levels are healthier. Numbers alone may not be enough to tell your real risk of a heart attack or stroke.