Dutch Lipid Score Calculator: How It Works

The Dutch lipid score calculator estimates the probability that a patient has familial hypercholesterolemia (FH), a genetic condition causing high LDL cholesterol. You enter clinical criteria such as family history, personal history of early cardiovascular disease, physical signs, and LDL level; the calculator returns a score from 0 to 8+ that categorizes risk as unlikely, possible, probable, or definite FH.

Formula

The Dutch Lipid Clinic Network (DLCN) score is a sum of points from four domains. Each domain contributes a fixed number of points based on criteria met:

• Family history: first-degree relative with premature CVD (men <55, women <60) OR known FH – 1 point; first-degree relative with LDL > 95th percentile – 1 point; children <18 with LDL > 95th percentile – 2 points.
• Clinical history: patient with premature CVD – 2 points; patient with cerebral or peripheral vascular disease – 1 point.
• Physical exam: tendon xanthomas – 6 points; corneal arcus before age 45 – 4 points.
• LDL level: > 8.5 mmol/L – 8 points; 6.5–8.4 – 5 points; 5.0–6.4 – 3 points; 4.0–4.9 – 1 point.
• Genetic testing: pathogenic mutation in LDLR, APOB, or PCSK9 – 8 points.

Total = sum of all points. The calculator above simplifies the four domains into single inputs (family, clinical, ldl, genetic) where you enter the points already assigned per domain. For a full clinical assessment, you must look up the point values from the criteria.

Worked Example

Using the default inputs: family history = 1 point (relative with premature CVD), clinical history = 0, LDL = 5.5 mmol/L (which falls in the 5.0–6.4 range, giving 3 points), genetic = 0. Total = 1 + 0 + 3 + 0 = 4 points. The DLCN interpretation: 0–2 points = unlikely FH; 3–5 = possible FH; 6–8 = probable FH; >8 = definite FH. So 4 points = possible FH.

When to Use This Calculator

This tool is used by clinicians when evaluating a patient with elevated LDL cholesterol or a family history of early heart disease. It helps decide whether genetic testing or specialist referral is warranted. It is not a diagnostic test by itself—it is a clinical decision aid. The score is most useful in adults; pediatric criteria differ slightly.

How to Read the Result

The score categorizes the likelihood of FH:

• 0–2: unlikely FH – consider other causes of hyperlipidemia.
• 3–5: possible FH – consider additional testing or repeat lipid profile.
• 6–8: probable FH – strong likelihood, refer to lipid specialist.
• >8: definite FH – genetic testing is recommended.

Higher scores correlate with higher cardiovascular risk, but the score does not predict the exact risk of a heart attack.

Common Mistakes and Limitations

• Unit mix-up: The LDL input is in mmol/L. In the US, labs often report LDL in mg/dL. To convert, divide mg/dL by 38.67 to get mmol/L. For example, 190 mg/dL ÷ 38.67 ≈ 4.9 mmol/L.
• Forgetting physical exam findings: Tendon xanthomas are rare but score high (6 points). They are often missed.
• Using treated LDL levels: If the patient is already on a statin, the LDL value will be lower, which underestimates the score. Use the untreated baseline LDL if available.
• Not all points are additive in the real tool: The DLCN has specific rules—e.g., only the highest LDL category counts, and family history points have a maximum. The simplified calculator assumes you enter the correct sub-score per domain.

Alternatives and Comparisons

Other FH screening tools include the Simon Broome criteria (UK) and the Make Early Diagnosis to Prevent Early Death (MEDPED) system. Simon Broome uses LDL thresholds and clinical signs but does not include a point score. MEDPED uses age-specific LDL cutoffs. The Dutch score is the most widely used in Europe and is recommended by many guidelines because it combines multiple domains and gives a probability-like score.

Safety and Accuracy Notes

This calculator is for educational and clinical decision support only. It does not replace a doctor’s judgment. If you or a relative have high LDL or early heart disease, see a healthcare provider. Genetic testing for FH is a personal decision; a positive result has implications for family members. Always confirm an elevated LDL with a repeat lipid panel after fasting.

Frequently Asked Questions

What does the Dutch lipid score actually measure?

It measures the likelihood that a person has familial hypercholesterolemia, a genetic disorder that causes very high LDL cholesterol from birth. It does not measure the risk of a heart attack directly, but FH itself increases that risk.

How do I convert LDL from mg/dL to mmol/L?

Divide the mg/dL value by 38.67. For example, 200 mg/dL ÷ 38.67 = 5.17 mmol/L. Always use the untreated LDL value if the patient is on lipid-lowering medication.

Can I use this calculator for children?

The DLCN criteria are primarily validated in adults. For children, different LDL cutoffs and family history criteria apply. Consult pediatric guidelines or a specialist.

What if I don’t know my family history?

That’s common. The score will be lower, but that doesn’t rule out FH. If LDL is very high (e.g., >5 mmol/L) or you have tendon xanthomas, you should still see a doctor.

Is a score of 5 a definite diagnosis?

No. A score of 3–5 is “possible FH.� A definite diagnosis usually requires a score >8 or a confirmed genetic mutation. Even with a lower score, a doctor may recommend genetic testing if the clinical suspicion is high.

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in family | Family history of premature CVD or high cholesterol | - | 0 | 0
in clinical | Personal history of premature CVD or xanthomas/arcus | - | 0 | 0
in ldl | LDL cholesterol (mmol/L) | mmol/L | 5.5 | 0
in genetic | DNA mutation found | - | 0 | 0
out score | Dutch Lipid Score | points | family + clinical + ldl + genetic | 0