What does "non-HDL cholesterol" mean and when is it useful?

Non-HDL cholesterol (total cholesterol minus HDL-C) is an easily calculated metric that includes LDL-C plus VLDL-C plus IDL-C (all atherogenic particles), it is a better predictor of cardiovascular events than LDL-C alone because it includes the triglyceride-rich lipoprotein fraction, and it correlates more closely with ApoB than LDL-C does, making it the most accessible ApoB proxy available from a standard lipid panel without additional cost (Boekholdt et al., JAMA, 2012).

Non-HDL cholesterol is particularly useful in two situations: (1) when a fasting lipid panel is not available (non-fasting LDL-C is unreliable in men with triglycerides above 200 mg/dL, but non-HDL-C is valid in non-fasting samples); (2) when ApoB testing is unavailable or unaffordable. The clinical target: below 130 mg/dL for average risk, below 100 mg/dL for high risk. At the population level, non-HDL below 130 mg/dL corresponds approximately to ApoB below 80 mg/dL in most men.

Honesty Scale: Solid (1) for non-HDL cholesterol as an ApoB proxy when ApoB testing is unavailable.

What to do: Calculate your non-HDL cholesterol from your last standard lipid panel. If above 130 mg/dL, request ApoB from your next panel and use non-HDL as an interim benchmark for treatment decisions.

For the full picture, read The ApoB/Lp(a)/Lipids Deep Dive