Apolipoprotein A1, or ApoA1 is a major protein that is a component of high-density lipoprotein, or HDL cholesterol. It helps clear cholesterol from the blood by removing cholesterol from organs and tissues to be destroyed by the liver.
What might a low result mean?
Low levels of apo A1, especially if increased levels of Apolipoprotein B are also seen, could be indicative of an increased risk of coronary heart disease.
What might a high result mean?
High levels of apo A1 are thought to be protective against heart disease.