What it measures
Apolipoprotein A1 (ApoA1) is the main protein on HDL particles, which carry cholesterol from the body's tissues back to the liver. It is a protein measure of HDL, read alongside the HDL cholesterol result.
Why people test it
- Part of advanced cholesterol panels, often measured with ApoB.
- Used to work out the ApoB to ApoA1 ratio.
- Checked when HDL cholesterol is very low or an inherited lipid disorder is suspected.
- Anabolic steroids are known to lower HDL and ApoA1, so it 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. One NHS lab gives 1.04 to 2.02 g/L for men and 1.08 to 2.25 g/L for women. Source: Leeds Teaching Hospitals NHS Trust: apolipoprotein A1.
Finger-prick or vein?
A finger-prick sample is usually fine for cholesterol tests, and some kits include ApoA1. A vein draw works too and is used when it is part of a larger panel.