Apolipoprotein B (ApoB)
Measures apolipoprotein B levels to assess cardiovascular disease risk through particle count, often considered more accurate than traditional cholesterol tests.
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Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
What this test measures
Apolipoprotein B (ApoB) is a protein found on the surface of every atherogenic lipoprotein particle, the particles capable of depositing cholesterol into artery walls. Each LDL, VLDL, IDL, and Lp(a) particle carries exactly one ApoB molecule, which means that measuring ApoB effectively counts the total number of these dangerous particles in the bloodstream.
This particle-counting approach offers an advantage over traditional cholesterol testing. A standard lipid panel measures the mass of cholesterol carried by LDL particles, but the number of particles matters independently: two people with identical LDL cholesterol readings can have very different particle counts depending on whether their particles are large and cholesterol-rich or small and dense. The person with more numerous small particles carries greater risk because each particle represents another opportunity for cholesterol to penetrate an artery wall. ApoB captures that distinction. It is why some individuals with seemingly normal LDL cholesterol still develop cardiovascular disease, and why a growing number of cardiologists and lipidologists consider ApoB a superior predictor of heart disease risk.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals with metabolic conditions such as diabetes, prediabetes, or metabolic syndrome, as these conditions often involve small, dense LDL particles that may not be detected by standard cholesterol tests.
- Those with a family history of premature heart disease or stroke, particularly if family members had cardiovascular events despite seemingly normal cholesterol levels.
- Patients whose traditional lipid panel results don't align with their overall risk profile, such as those with normal LDL cholesterol but other cardiovascular risk factors.
- People with elevated triglycerides (above 150 mg/dL), as high triglyceride levels are often associated with increased numbers of atherogenic particles that ApoB can detect.
- Individuals already taking cholesterol-lowering medications who want to monitor their residual cardiovascular risk beyond standard lipid measurements.
- Those with fatty liver disease, obesity, or insulin resistance, as these conditions are associated with altered lipoprotein particle composition that ApoB testing can reveal.
What to expect
Preparation
Fast for 12-14 hours before the blood draw. Only water is permitted during the fasting period. Continue taking regular medications unless specifically instructed otherwise by a healthcare provider.
Sample Type
A simple blood draw from a vein in the arm, similar to other routine blood tests. The procedure typically takes less than five minutes.
Collection
Visit a participating lab location where a trained phlebotomist will collect the blood sample. No special equipment or extended procedures are required.
Turnaround
Results are typically available within 1-3 business days and will be delivered securely through the online patient portal.
Understanding your results
Results are reported in milligrams per deciliter (mg/dL). Levels below 90 mg/dL are generally considered acceptable for individuals without additional cardiovascular risk factors, while levels between 90 and 130 mg/dL are classified as borderline to moderately elevated. Readings above 130 mg/dL indicate increased risk for heart and blood vessel disease. Healthcare providers interpret ApoB alongside the standard lipid panel, Lp(a) if available, and individual cardiovascular risk factors to determine whether the particle burden warrants lifestyle modification or medical intervention.
| Population | Reference Range | Notes |
|---|---|---|
| Adults (general) | Less than 90 mg/dL | Optimal level for cardiovascular health |
| Adults (borderline risk) | 90-129 mg/dL | Borderline high to moderately elevated risk |
| Adults (high risk) | 130 mg/dL or higher | Significantly increased cardiovascular risk |
Reference ranges may vary by laboratory and individual factors. Results should be interpreted by a healthcare provider in the context of your overall health.
What does a “Low” result mean?
Low ApoB levels (below 40-50 mg/dL) are less common but may result from conditions such as hyperthyroidism, liver cirrhosis, or malnutrition. Very low levels may occasionally indicate rare genetic conditions like Bassen-Kornzweig syndrome (abetalipoproteinemia), characterized by apolipoprotein B deficiency. However, most cases of low ApoB are associated with other underlying health conditions that require separate evaluation and diagnosis.
What does a “High” result mean?
Elevated ApoB levels (above 130 mg/dL) may indicate an increased risk of cardiovascular disease, as higher levels suggest more atherogenic particles circulating in the bloodstream. High ApoB levels can indicate decreased cholesterol removal from the blood, suggesting the body cannot effectively clear excess cholesterol. This reduced clearance may lead to plaque buildup that constricts arteries and increases heart disease risk. Other factors that can elevate ApoB include diabetes, metabolic syndrome, kidney disease, pregnancy, hypothyroidism, or certain medications.
Privacy & confidentiality
Your ApoB test results are completely confidential and protected under HIPAA regulations. Results are not shared with your personal physician unless you specifically request it, are not added to your medical records, and do not appear on insurance explanation of benefits statements.
Frequently asked questions
Related tests
Lipid Panel
Standard cholesterol test that complements ApoB measurement for comprehensive cardiovascular risk assessment
View TestC-Reactive Protein (CRP)
Measures inflammation that contributes to cardiovascular disease risk alongside particle measurement
View TestHomocysteine
Additional cardiovascular risk marker that works synergistically with ApoB for comprehensive heart disease screening
View TestInsulin
Insulin resistance often correlates with elevated ApoB levels and small, dense LDL particles
View TestRelated conditions
Last reviewed: April 2026
CPT Code: 82172
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
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