What it measures
Apolipoprotein B (ApoB) is the main protein on LDL and the other particles linked to cholesterol build-up in the arteries. Each of these particles carries one ApoB, so the test counts the particles rather than measuring the cholesterol they hold.
Why people test it
- Used as an extra measure of heart and circulation risk alongside a standard cholesterol test.
- Useful when triglycerides are high, as the usual LDL figure is less reliable then.
- Measured in some people with a family history of high cholesterol or early heart disease.
- Checked by some people on TRT or after anabolic steroid use, both of which can change blood lipids.
Typical range
Ranges vary between labs, with the method used, age and sex, and your report shows the lab's own range.
Finger-prick or vein?
A finger-prick sample is usually fine for ApoB. A vein draw works too and is used when it is part of a larger panel.