Understanding the marker
This ratio divides Apo B by Apo A1. It compares a protein in LDL and related particles with the main protein in HDL.
The ratio gives additional context to the blood-fat profile. The individual Apo B and Apo A1 results remain useful because different combinations can give the same ratio. It does not replace a full cardiovascular assessment or an individual treatment target.
What does high ApoB to ApoA1 ratio mean?
A high ratio means more Apo B relative to Apo A1. The individual values and the wider cardiovascular assessment determine what it means and whether follow-up is needed.
What does low ApoB to ApoA1 ratio mean?
A low ratio means less Apo B relative to Apo A1. Read both individual results alongside the other blood fats; the ratio alone is not a complete assessment of cardiovascular health.
More markers in the same area
This is general information about the marker, not an assessment of your values and not medical advice. Last updated: October 2026.