Understand your Apolipoprotein B (Apo B) Blood Test Results…

This page helps you to understand blood test results for Apo B and gives you the reference range to determine if your lab test results mean that you have high Apo B, low Apo B or normal Apo B levels. 

We outline the risk factors associated with both raised and low Apo B levels.

Reference Ranges for Apo B:

Measurement unit Metric Optimal Borderline Risk
US Conventional Units mg/dl <=89 90-119 >=120
Standard International Units mmol/L <=2.3 2.4-3.1 >=3.2
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What is Apo B

Apo B is the primary protein component of LDL. ApoB is generally regarded as a better indicator of circulating LDL compared to LDL cholesterol [11].

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Function of Apo B

Low-density lipoproteins are the primary carriers of cholesterol in the blood. Apo B allows these particles to attach to specific receptors on the surface of cells, particularly in the liver. The receptors transport low-density lipoproteins into the cell, where they are broken down to release cholesterol. The cholesterol is then used by the cell, stored, or removed from the body [12].

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Risk factors associated with Apo B

Apo B is associated with increased risk of developing heart disease and often outperforms LDL cholesterol as a marker for predicting risk.  For example, patients with acceptable LDL cholesterol but elevated Apo B remain at higher risk of developing heart disease, conversely, patients with acceptably low Apo B but moderate LDL cholesterol elevations are at a comparably reduced risk for heart disease [11].

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Notable variations by demographic group

Apo B levels are higher in males than in females and tend to increase with age [11].

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