No fasting required.

An Apolipoprotein-B test helps your doctor analyze whether or not you are at risk for heart disease. It measures the amount of apolipoprotein B in your blood. Apolipoprotein B attaches to negative types of cholesterol that cause plaque buildup in your blood vessels, which can lead to damage and heart disease.  

Apolipoprotein B-100 is a protein that helps carry fat and cholesterol through your body. It is also called apolipoprotein B or apoB, for short.