The apolipoprotein A-1 (apo A-1) blood test is used to evaluate survival rate or risk factors for individuals with past heart attacks and peripheral vascular diseases. Apo A-1 recycles cholesterol from the tissues back to the liver for further processing. It keeps the arteries clear of plaque-forming cholesterol.
Exciting new research indicates that the ratio of apolipoprotein B:apolipoprotein A-1 may correlate better with increased risk of coronary artery disease (CAD) than total cholesterol, and LDL:HDL ratio.1
Studies also show that a lower apolipoprotein B:apolipoprotein A-1 ratio is cardioprotective, whereas a high ratio indicates increased risk for heart disease.2
A 12 to 14 hour fast is required for this blood test. However, drink water to stay hydrated and take your medications as prescribed.
Clin Chem. 2009; 55(3):407-419
Mayo Clin Proc. 1986; 61(5):313-320