Help & Support

LipidScan calculates LDL using the Friedewald formula:

LDL = Total Cholesterol - HDL - (Triglycerides / 2.2)

This formula is accurate when triglycerides are below 4.5 mmol/L (400 mg/dL). If your triglycerides are higher, the calculation becomes unreliable and LDL won't be shown.

Note: Your lab may use a different method (like direct LDL measurement), which can produce slightly different results.

There are a few common reasons:

• Different units: Make sure you're entering values in the correct unit (mg/dL or mmol/L). Check your lab report carefully.
• LDL calculation method: Labs may measure LDL directly, while we calculate it from other values (see above).
• Rounding: Small differences can occur due to rounding during unit conversion.

Status colors are based on clinical guidelines (AHA, NICE, or ESC depending on your setting):

These are general population guidelines. Your doctor may set different targets based on your individual risk factors.

When you haven't entered a measured ApoB value, we estimate it using the Hwang formula:

ApoB = 0.65 × (TC - HDL) + 0.1 × Triglycerides

Estimated values are marked with an asterisk (*). For the most accurate reading, ask your doctor to include ApoB in your next lipid panel.

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We support three clinical guideline systems:

• US AHA/ACC: American Heart Association guidelines - most common in the US
• UK NICE: UK National Institute for Health and Care Excellence
• EU ESC/EAS: European Society of Cardiology guidelines

Choose the guideline that matches where you receive care, or what your doctor uses. You can change this in your Profile settings.