Normal Lipoprotein Levels in Adults
For adults, optimal lipid levels are: LDL cholesterol <100 mg/dL, HDL cholesterol ≥40 mg/dL (≥50 mg/dL for women), triglycerides <150 mg/dL, total cholesterol <200 mg/dL, and non-HDL cholesterol <130 mg/dL. These targets are based on cardiovascular risk reduction and represent the most current evidence-based thresholds for preventing atherosclerotic cardiovascular disease 1, 2, 3, 1.
Primary Lipid Parameters
LDL Cholesterol (Low-Density Lipoprotein)
- Optimal: <100 mg/dL (2.6 mmol/L) 1, 3, 1
- Near optimal: 100-129 mg/dL
- Borderline high: 130-159 mg/dL
- High: 160-189 mg/dL
- Very high: ≥190 mg/dL 4
LDL cholesterol remains the primary target for cardiovascular risk reduction, as lowering LDL is directly associated with reduced cardiovascular events 1. The 2018 ACC/AHA guidelines emphasize that for very high-risk patients with established cardiovascular disease, an LDL goal of <70 mg/dL may be reasonable 2, 5, 6.
HDL Cholesterol (High-Density Lipoprotein)
- Desirable: ≥40 mg/dL (1.02 mmol/L) for men 1, 3, 1
- Desirable: ≥50 mg/dL (1.29 mmol/L) for women 2, 1
- Low (risk factor): <40 mg/dL for men, <50 mg/dL for women
Women typically have HDL levels approximately 10 mg/dL higher than men, which is why gender-specific targets exist 2, 1. An HDL level ≥60 mg/dL is considered protective and counts as a "negative" risk factor 7.
Triglycerides
- Normal: <150 mg/dL (1.7 mmol/L) 1, 3, 1
- Borderline high: 150-199 mg/dL
- High: 200-499 mg/dL
- Very high: ≥500 mg/dL 8
Triglyceride levels ≥500 mg/dL warrant immediate attention due to pancreatitis risk 8. Levels between 200-499 mg/dL are associated with increased cardiovascular risk, particularly when combined with low HDL 9.
Total Cholesterol
- Desirable: <200 mg/dL (5.17 mmol/L) 10, 4
- Borderline high: 200-239 mg/dL
- High: ≥240 mg/dL (6.22 mmol/L) 10, 4
While total cholesterol is useful for initial screening, it provides less specific information than a complete lipid profile 4, 11.
Non-HDL Cholesterol
- Optimal: <130 mg/dL (for those with LDL goal <100 mg/dL) 2, 3
- Target is 30 mg/dL higher than LDL target 7, 9
Non-HDL cholesterol (calculated as total cholesterol minus HDL cholesterol) captures all atherogenic lipoproteins and is particularly valuable when triglycerides are elevated (150-400 mg/dL), as it doesn't require fasting and remains accurate when LDL calculation becomes unreliable 7, 9.
Important Clinical Considerations
Fasting vs. Non-Fasting: Total cholesterol and HDL can be measured non-fasting, but a complete fasting lipid profile (12-hour fast) provides the most accurate assessment, particularly for triglycerides and calculated LDL 8. Recent evidence supports non-fasting lipid profiles for most screening purposes 12.
VLDL Cholesterol: While not routinely reported as a separate target, VLDL cholesterol is estimated as triglycerides/5 when triglycerides are <400 mg/dL 8. Normal VLDL is approximately 30 mg/dL or less.
Risk-Based Targets: These "normal" values represent population-based optimal levels for cardiovascular disease prevention. However, treatment targets become more aggressive based on individual cardiovascular risk 1, 2, 3, 1. Patients with established cardiovascular disease, diabetes, or very high risk may require LDL <70 mg/dL 2, 5.
Screening Frequency: Adults with optimal lipid levels (LDL <100 mg/dL, HDL ≥60 mg/dL, triglycerides <150 mg/dL) can be reassessed every 2 years, while those with abnormal values or on treatment require annual or more frequent monitoring 1.
Common Pitfall: Don't rely solely on total cholesterol. Two patients with identical total cholesterol can have vastly different cardiovascular risk depending on their HDL and LDL distribution 8. Always obtain a complete lipid profile including HDL, LDL, and triglycerides for accurate risk assessment.