Heart and cholesterol
LDL cholesterol to ApoB ratio
LDL-C/ApoB
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Compare membershipsHow much cholesterol each particle carries, on average.
The LDL-C/ApoB ratio is calculated by dividing your LDL cholesterol by your ApoB. Because each plaque-forming particle carries one ApoB, the ratio gives a rough sense of how much cholesterol is packed into each particle.
This ratio is mostly used in research.
A lower ratio suggests smaller particles that each carry less cholesterol. That pattern tends to appear with high triglycerides and insulin resistance, and it can mean your particle count is higher than your LDL cholesterol alone would suggest.
Research on this ratio is still developing, and guidelines don't use it to guide treatment. Its main value is pointing you back to ApoB, which reflects the number of particles more directly.
When the ratio is low, ApoB tells the clearer story.
Questions
What does a low ratio mean?
A low ratio suggests your LDL particles are, on average, smaller and carry less cholesterol each. It often appears with higher triglycerides and lower HDL. It may also mean your LDL cholesterol understates your particle count, which is worth discussing with a clinician.
Do I need to act on this ratio?
The ratio is mostly descriptive. Decisions are usually based on ApoB, LDL cholesterol, and your overall risk. In the MyHealthspan app, the AI health assistant can help you see how this ratio fits with your other results.
Sources and references
- Sniderman et al., Apolipoprotein B particles and cardiovascular disease: a narrative review (JAMA Cardiol, 2019)
- Glavinovic et al., Physiological bases for the superiority of ApoB over LDL-C and non-HDL-C (J Am Heart Assoc, 2022)
- Millán et al., Lipoprotein ratios: physiological significance and clinical usefulness (Vasc Health Risk Manag, 2009)