LDL Friedewald calculator online: cholesterol calculation for lipid panel
LDL by Friedewald: LDL = TC – HDL – TG/2.2 (mmol/L) or TG/5 (mg/dL). Used in cardiology and primary care for cardiovascular risk stratification when direct LDL is unavailable.
About this calculator
The Friedewald formula (1972) is an indirect method for LDL cholesterol calculation from a standard lipid panel when direct immunoassay or ultracentrifugation is unavailable. Calculation: LDL = total cholesterol – HDL – triglycerides/2.2 (in mmol/L) or /5 (in mg/dL). Used in cardiology, primary care, and endocrinology for cardiovascular risk stratification and statin therapy decisions. The formula is invalid at triglycerides >4.5 mmol/L (400 mg/dL), in chylomicronemia, type III dysbetalipoproteinemia, LCAT deficiency, and within 8 hours of a fatty meal – LDL is underestimated and direct measurement is required. ESC 2019 LDL targets: <1.4 mmol/L in very high risk (secondary prevention, diabetes with organ damage, eGFR <30), <1.8 in high, <2.6 in moderate, <3.0 in low risk. At triglycerides 1.7–4.5 mmol/L, the Martin-Hopkins and Sampson equations are more accurate alternatives.
Source
Formula version: friedewald-1972-v1
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