LDL Cholesterol
LDL cholesterol (LDL-C) measures the amount of cholesterol carried by low-density lipoprotein particles. Elevated LDL-C is a well-established causal risk factor for atherosclerotic cardiovascular disease (ASCVD), including heart attacks and strokes.
Standard LDL-C is typically calculated using the Friedewald equation (Total Cholesterol - HDL - Triglycerides/5), though direct measurement is more accurate when triglycerides are high. LDL-C alone doesn't capture particle number — a person can have "normal" LDL-C but a high number of small, dense LDL particles that carry greater risk.
For this reason, many clinicians recommend pairing LDL-C with ApoB or LDL particle number (LDL-P) for a more complete picture. The combination of LDL-C and ApoB provides both cholesterol content and particle count information.
What It Measures
LDL-C measures the total amount of cholesterol within LDL particles. It reflects the cholesterol mass carried by LDL, not the number of LDL particles.
Reference Ranges
| Status | Range (mg/dL) |
|---|---|
| Optimal | < 100 mg/dL |
| Normal | 100–129 mg/dL |
| Borderline | 130–159 mg/dL |
| Out of Range | >= 160 mg/dL |
Optimal Ranges
| Group | Range | Unit | Source |
|---|---|---|---|
| Low risk | 0–100 | mg/dL | ACC/AHA guidelines |
| Moderate risk | 100–130 | mg/dL | ACC/AHA guidelines |
| Optimal (preventive) | 0–70 | mg/dL | ESC guidelines |
When Values Are High
Elevated LDL-C is a causal risk factor for atherosclerotic cardiovascular disease. However, LDL-C is an imperfect proxy — ApoB (particle count) is a better predictor of risk.
When Values Are Low
Very low LDL-C (<40 mg/dL) is generally not harmful when achieved through lifestyle or statins. Some genetic conditions cause very low LDL naturally with no adverse effects.
What To Do
Lifestyle
- •Reduce saturated fat intake (replace with MUFA/PUFA)
- •Increase soluble fiber (oats, legumes, flaxseed)
- •Regular aerobic exercise improves LDL particle size
- •Maintain healthy weight — obesity increases small dense LDL
Supplements
- •Plant sterols/stanols (2g/day) reduce LDL by 6–10%
- •Psyllium husk fiber (5–10g/day)
- •Red yeast rice contains natural lovastatin (discuss with physician)
When to Retest
Retest 6–8 weeks after dietary changes; 4–6 weeks after statin initiation
How GATOR Tracks This
Lab Providers
Related Clinical Ratios
Related Biomarkers
This content is for informational purposes only and does not constitute medical advice. Reference ranges may vary by laboratory and individual factors. Consult a qualified healthcare provider for interpretation of your results and treatment decisions.
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