ApoB, the particle count Apolipoprotein B (ApoB)
A count of the particles that can lodge in an artery wall.
Also printed asApoB · Apo B · ApoB-100
What it measures
One ApoB sits on every artery-settling particle, so this is a headcount of them rather than a measure of their cargo.
The single best lipid predictor of heart attack; two people with identical LDL can carry very different particle counts.
Why it matters for how long you stay well
Two people with the same LDL can carry very different particle counts, and it is the count that tracks risk, so this is the number most worth lowering and holding low for decades.
How it shows up in daily life
You cannot feel it, but it answers the question your cholesterol numbers only guess at: how many particles are actually there.
High and low readings
When it reads high
More particles are available to settle into artery walls.
When it reads low
Low ApoB is protective.
What moves it
Daily life
- saturated fat
- refined carbohydrate and sugary drinks
- weight around your middle
- an underactive thyroid
- aerobic exercise
Medicines known to shift it
- statins (lower it)
- thyroid hormone replacement (lowers it when the thyroid was slow)
Listed so a result can be read in context. It is not advice to start, stop or change any medicine; that decision belongs with your physician.
Read it with
Markers that move this one, or that this one moves. One number read alone can mislead.
- TSH, the thyroid signalObserved association
TSH pushes it up
ApoB counts the particles your liver has not yet collected. A slow thyroid means fewer collections, so the count creeps up alongside the cholesterol.
- LDL, the carrying cholesterolKnown mechanism
As this rises, LDL moves with it
ApoB counts the particles while LDL weighs the cholesterol inside them. Two people with the same LDL can carry very different particle counts, and it is the count that tracks risk.
- Non-HDL cholesterolObserved association
As this rises, Non-HDL cholesterol moves with it
Non-HDL captures nearly the same particles apoB counts. That is why the two usually agree closely, and why non-HDL stands in well when apoB is not available.
- ApoB–ApoA1 balanceKnown mechanism
As this rises, ApoB–ApoA1 balance rises with it
This balance sets the settling particle count against the clearing one. Both numbers come from tests you already had, so it measures nothing new.
Common questions
What does Apolipoprotein B measure?
One ApoB sits on every artery-settling particle, so this is a headcount of them rather than a measure of their cargo. The single best lipid predictor of heart attack; two people with identical LDL can carry very different particle counts.
What does a high ApoB result usually mean?
More particles are available to settle into artery walls.
What does a low ApoB result usually mean?
Low ApoB is protective.
What is the usual reference range for ApoB?
A broad adult reference band is 40–90 mg/dL. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Adults
- 40–90 mg/dL
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in mg/dL
Ageing relevance
5/5
A direct input to a validated biological-age algorithm.
Worth knowing
Every one of these particles carries exactly one apoB protein, so counting the protein counts the particles.
Related reading
Have a report with this marker on it? Read it in context.
Upload it to Oraia, our health-intelligence tool, for a plain-language read of your markers that a Genoryx doctor can review.
Your biological age is a number you can measure.
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