What it measures
ApoB divided by ApoA1, worked out by the lab from the two results. ApoB sits on LDL and other particles that carry cholesterol into the tissues, and ApoA1 sits on HDL particles that carry it back to the liver, so the ratio compares the two.
Why people test it
- Reported in advanced cholesterol panels that measure both ApoB and ApoA1.
- Used as one summary of heart and circulation risk, alongside standard cholesterol results.
- Anabolic steroids can lower ApoA1 and raise ApoB, so the ratio is sometimes checked during or after a cycle.
Typical range
Ranges vary between labs, with the method used, age and sex, and your report shows the lab's own range. Labs that report the ratio set their own reference values.
Finger-prick or vein?
A finger-prick sample is usually fine for cholesterol tests. A vein draw works too and is used when it is part of a larger panel.