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Understand LDL-C/ApoB Ratio

LDL-C/ApoB Ratio

Heart & circulation markers

What the test generally measures, and what to ask about it.

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Updated Jul 13, 2026

What is LDL-C/ApoB Ratio?

A calculated ratio that estimates the average cholesterol content per bad-cholesterol particle, used as a rough marker of LDL particle size.

This is a calculated value: it divides your LDL cholesterol (amount of cholesterol carried) by your apolipoprotein B (the number of atherogenic particles, one ApoB each) - LDL-C divided by ApoB. A higher ratio can be associated with larger, more buoyant LDL particles, a lower ratio can be associated with smaller, denser particles that some research links to higher risk. It is an interpretive estimate, not a diagnosis.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.

References

Official source "AMORIS study - ApoB as atherogenic particle-number marker" PubMed. pubmed.ncbi.nlm.nih.gov/11755609.

About our sources

Clinical / professional

Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.

Peer-reviewed research

Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.

History of updates

Published · Jul 13, 2026
First published, calculated index, formula + sources independently fact-checked.

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