Assessing the Accuracy of LDL-Cholesterol Estimation Formulas in the Tunisian Population

Area of Science:

• Cardiology
• Clinical Chemistry
• Public Health

Background:

• International guidelines emphasize LDL-C measurement for cardiovascular risk assessment and patient monitoring.
• Direct LDL-C measurement is complex and costly in clinical practice.
• Formula-based LDL-C estimation offers a simpler, more economical alternative.

Purpose of the Study:

• To evaluate the accuracy of Friedewald, Sampson, and Martin/Hopkins LDL-C estimation formulas.
• Comparison was made against direct LDL-C measurement in Tunisian patients.

Main Methods:

• A cross-sectional study included 148 Tunisian patients from Farhat Hached University Hospital.
• Clinical data, metabolic parameters, and lipid profiles, including direct LDL-C, were analyzed.
• LDL-C was estimated using Friedewald, Martin/Hopkins, and Sampson formulas.

Main Results:

• All three formulas showed comparable fasting correlation with measured LDL-C (r=0.52-0.55).
• One hour postprandial, strong correlations (r > 0.7) were observed for all formulas.
• Two hours postprandial, moderate correlations were found between estimated and measured LDL-C.

Conclusions:

• Friedewald, Sampson, and Martin/Hopkins formulas demonstrated acceptable accuracy for LDL-C estimation in Tunisian patients.
• Formula-based LDL-C estimation is a practical and cost-effective approach for routine clinical practice.
• These findings support the widespread use of LDL-C estimation formulas for cardiovascular risk management.