This test measures the amount of a certain type of protein on the surface of cholesterol called apolipoprotein B-100 (ApoB) in your blood. ApoB is the main protein found in the low-density lipoproteins (LDL). LDL cholesterol is also called "bad" cholesterol because high levels of it can damage your heart and arteries.
The reference range of apoB levels in adults is less than 130 mg/dL (1.3 g/L). ApoB levels are higher in males than in females and tend to increase with age.
Elevated levels of apo B correspond to elevated levels of LDL-C and to non-HDL-C and are associated with an increased risk of cardiovascular disease (CVD). Elevations may be due to a high-fat diet and/or decreased clearing of LDL from the blood.