ApoB / ApoA-I
The ratio of atherogenic to protective lipoprotein particles.
What is it
This ratio compares the number of plaque-forming particles (ApoB) to the number of protective particles (ApoA-I). A single number captures the balance between the two systems.
Why it's measured
The ApoB:ApoA-I ratio has been cited as one of the stronger lipid-related predictors of cardiovascular risk in published research, including data from the INTERHEART study.
Reference range
Standard laboratory reference
< 0.7 ratio
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Has been associated with a less favorable lipoprotein balance and increased cardiovascular risk in published research.
Lower
Is generally considered favorable — more protective particles relative to atherogenic particles.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Reported alongside ApoB and ApoA-I on advanced lipid panels.
Related markers
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.