How to Calculate Non-HDL Cholesterol
Non-HDL cholesterol is calculated by simply subtracting HDL cholesterol from total cholesterol: Non-HDL-C = Total Cholesterol - HDL Cholesterol 1, 2.
The Calculation
The formula is straightforward and requires only two values from a standard lipid panel:
- Non-HDL-C = Total Cholesterol - HDL Cholesterol
This can be performed on either fasting or non-fasting samples 1, 2.
What Non-HDL Cholesterol Represents
Non-HDL cholesterol comprises the cholesterol content of all atherogenic (plaque-forming) lipoproteins in your blood, including:
- LDL (low-density lipoprotein) cholesterol
- VLDL (very low-density lipoprotein) cholesterol
- IDL (intermediate-density lipoprotein) cholesterol
- Remnant lipoproteins 2
Key Advantages Over LDL Cholesterol Calculation
Non-HDL cholesterol is superior to calculated LDL cholesterol in several clinical situations 2:
Works with high triglycerides: Unlike the Friedewald formula for LDL-C (which becomes invalid when triglycerides exceed 400 mg/dL or 4.5 mmol/L), non-HDL-C remains accurate regardless of triglyceride levels 2
No fasting required: Can be reliably calculated from non-fasting samples, making it more practical for screening 1, 2
Better risk prediction: Non-HDL cholesterol predicts cardiovascular disease risk similarly to or even better than LDL cholesterol, particularly in patients with elevated triglycerides 2
Clinical Context
Non-HDL cholesterol is particularly useful for risk stratification in individuals with:
- Moderately elevated triglycerides (200-500 mg/dL)
- Diabetes mellitus
- Metabolic syndrome or insulin resistance
- Established atherosclerotic cardiovascular disease 1
Target Values
When using non-HDL cholesterol as a treatment target, the goal is typically 30 mg/dL (0.8 mmol/L) higher than the corresponding LDL cholesterol target 2. For example, if your LDL-C target is 100 mg/dL, your non-HDL-C target would be 130 mg/dL.