Two types of tests are included in an Apolipoproteins profile: A-1 and B. These tests are ordered, along with other lipid tests, to assess the individuals risk of developing cardiovascular disease. This is not a routinely ordered test; ordered only when a person has a family history of heart disease or high levels of cholesterol. Apo A-1 is a protein which is involved in the metabolism of lipids and is the primary component of high-density lipoprotein, i.e. ‘good cholesterol.’ Apo B is a protein with the same function but is a primary component of low-density lipoprotein, i.e. ‘bad cholesterol.’