Is my ApoB (Apolipoprotein B) normal?
Free blood test checker · Standard + longevity-optimal ranges
What is a normal ApoB level?
ApoB measures the total number of atherogenic (artery-clogging) particles in your blood. Every LDL, VLDL, IDL, and Lp(a) particle carries exactly one ApoB molecule, making it a direct count of all particles that can penetrate and damage your arterial walls. This one-to-one stoichiometric ratio is why ApoB is considered the single best predictor of cardiovascular risk — superior to LDL-C, which only measures cholesterol mass. The 2019 ACC/AHA guidelines classify ApoB above 130 mg/dL as a definitive risk-enhancing factor. Standard target: below 90 mg/dL. Longevity-focused physicians target below 80 mg/dL, with aggressive goals of below 60 mg/dL for optimal healthspan.
| Range | Values |
|---|---|
| Standard Reference | 0–90 mg/dL |
| Optimal | 0–80 mg/dL |
| Longevity Optimal | < 80 mg/dL (< 60 longevity goal) |
| High Risk | > 120 mg/dL |
What causes abnormal ApoB levels?
Elevated ApoB is caused by the same factors that raise LDL: high saturated fat diet, genetic predisposition (familial hypercholesterolemia), obesity, insulin resistance, hypothyroidism, and chronic kidney disease. ApoB can be high even when LDL-C appears normal — this is called "discordance" and means you have many small, dense LDL particles that are especially effective at penetrating the arterial wall.
When should you see a doctor?
See your doctor if ApoB is above 90 mg/dL, especially if you have a family history of premature heart disease. If ApoB is above 120 mg/dL, discuss aggressive lipid-lowering therapy. ApoB testing is particularly important if your LDL and triglycerides are discordant or if you have metabolic syndrome.
ApoB and longevity
ApoB has emerged as the cornerstone biomarker in longevity-focused cardiology. Because every atherogenic particle carries exactly one ApoB molecule, it provides an exact particle count — unlike LDL-C, which measures the cholesterol cargo and can be misleadingly low in patients with many small, dense particles. This discordance is especially common in insulin-resistant individuals, who may have "normal" LDL-C but dramatically elevated cardiovascular risk. Preventive cardiologists increasingly advocate treating ApoB aggressively and decades earlier than traditional guidelines suggest, based on evidence that cumulative atherogenic particle exposure drives lifetime cardiovascular risk. The European Atherosclerosis Society targets below 65 mg/dL for high-risk patients, while some longevity experts push for below 60 mg/dL.
Where to get a ApoB test
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Related biomarkers
These biomarkers are often tested alongside ApoB for a more complete picture.
Frequently asked questions
What is a normal ApoB level?
Is ApoB more important than LDL?
What is LDL-ApoB discordance?
How do I get an ApoB test?
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Sources: Reference ranges based on AHA/ACC, ADA, and AACE clinical guidelines. Biological variation data from Ricos/Westgard database. Longevity-optimal ranges reflect targets used by preventive and functional medicine practitioners.
- 2019 ACC/AHA Guideline on Primary Prevention — Risk-Enhancing Factors
- Measuring cardiovascular disease risk and the importance of ApoB — Peter Attia
Last reviewed: April 2026. This tool provides general health information and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider about your specific results.