What it measures.
Non-HDL cholesterol is simply Total Cholesterol minus HDL. This captures all cholesterol carried by atherogenic particles—LDL, VLDL, IDL, and Lp(a). When ApoB testing isn't available, non-HDL serves as an excellent surrogate for cardiovascular risk.
Non-HDL-C = Total Cholesterol - HDL Cholesterol. This represents the cholesterol content of all atherogenic (potentially artery-clogging) particles combined. It's easily calculated from any standard lipid panel without additional testing.
Why it matters.
Non-HDL is a better predictor of cardiovascular risk than LDL-C alone, especially when triglycerides are elevated. Guidelines from AHA, ACC, and European societies recognize non-HDL as a secondary target after LDL, and some argue it should be primary.
Physiology.
Non-HDL represents all non-protective cholesterol in circulation. LDL carries about 70% of this in most people, but VLDL remnants (rich in triglycerides) and Lp(a) contribute importantly, especially in those with metabolic dysfunction. These particles all share the ability to penetrate artery walls and drive atherosclerosis.
Testing & preparation.
How to prepare
- Calculated from standard lipid panel
- Fasting preferred but not required
- No additional test needed—just subtract HDL from total cholesterol
When to test
Calculate from every lipid panel. Especially valuable when triglycerides are >150 mg/dL, making LDL calculation less reliable.
How often
Whenever lipid panel is checked; typically annually or more frequently during treatment.
Interpretation.
High non-hdl cholesterol
Common causes:
- All causes that elevate LDL
- Elevated triglycerides/VLDL
- Metabolic syndrome
- Elevated Lp(a)
- Combined hyperlipidemia
Implications:
- Better risk indicator than LDL alone
- Captures triglyceride-rich remnants missed by LDL
- Indicates total atherogenic burden
- Target for therapy in addition to LDL
Low non-hdl cholesterol
Common causes:
- Effective lipid therapy
- Low-fat diet
- Genetic factors
- Hyperthyroidism
Implications:
- Reduced cardiovascular risk
- Total atherogenic burden is low
- Good overall lipid management
Optimization.
Diet
- Same strategies as LDL reduction
- Reduce triglycerides through carbohydrate restriction (lowers VLDL contribution)
- Increase soluble fiber
- Plant sterols and stanols
Lifestyle
- Weight loss addresses both LDL and triglyceride components
- Exercise reduces VLDL and improves overall lipid profile
- Same interventions as LDL optimization
Supplements
- Omega-3s help reduce triglyceride/VLDL component
- Same supplements effective for LDL
FAQs.
Why use non-HDL instead of LDL?
Non-HDL captures all atherogenic particles, including VLDL remnants that LDL misses. It's especially valuable when triglycerides are elevated (>150 mg/dL), where LDL calculation becomes inaccurate but non-HDL remains reliable.
How do I calculate my non-HDL?
Simply subtract your HDL from your total cholesterol. If total cholesterol is 200 and HDL is 50, your non-HDL is 150 mg/dL. Most labs now report this automatically.
What's the relationship between non-HDL and ApoB?
Non-HDL and ApoB are highly correlated (r ~0.85). When they're concordant, either can guide treatment. When discordant, ApoB is preferred but non-HDL is a reasonable fallback if ApoB isn't available.
What should my non-HDL target be?
For primary prevention, target non-HDL <100 mg/dL (corresponds roughly to LDL <70 mg/dL). Those with established cardiovascular disease may target <85 mg/dL. Always discuss targets with your clinician based on your overall risk.