Apo B, Apolipoprotein B-100

This is a test done to determine your risk of coronary disease. Apo B-100 levels are used, along with other lipid tests, to help determine an individual's risk of developing atherosclerotic heart disease and CAD. It is not used as a general population screen but may be ordered when a patient has a family history of heart disease or hyperlipidemia. Occasionally Apo B-100 levels may be ordered to monitor the effectiveness of lipid treatment.

Apo B-100 levels tend to mirror LDL levels, but unlike calculated LDL, Apo B-100 levels can be measured directly. Many experts think that Apo B-100 levels may eventually prove to be a better indicator of risk of atherosclerotic heart disease than LDL. Others disagree but feel that Apo B-100 and other emerging cardiac risk markers such as Apo A-I, Lp(a), and hs-CRP may offer valuable additional information.


A blood sample is obtained by inserting a needle into a vein in the arm.


  • Adult/older adult

  • Male: 50-125 mg/dL

  • Female: 45-120 mg/dL

  • Newborn: 11-31 mg/dL

  • Child, 6 months to 3 years: 23-75 mg/dL

  • Child / adolescent, 5-17 years

  • Male: 47-139 mg/dL

  • Female: 41-132 mg/dL

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.


Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.


It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.