What it measures
LDL cholesterol is the cholesterol carried by low-density lipoprotein, the main carrier of cholesterol out to the body's tissues. Most labs calculate it from total cholesterol, HDL and triglycerides rather than measuring it directly.
Why people test it
- Part of a cholesterol test, used in estimating heart and stroke risk.
- Monitored on statins and other cholesterol-lowering prescriptions, often a few months after starting.
- Measured in people with a family history of high cholesterol.
- Anabolic steroids are known to raise LDL, so it is often 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.
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.
LDL is usually calculated using triglycerides, which rise after eating, so some labs ask for a fasting sample.