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Related Experiment Videos

Comparative determinations of low-density-lipoprotein-cholesterol.

F J Sánchez-Muniz1, C Cuesta, B San-Félix

  • 1Departamento de Nutrición y Bromatología I (Nutrición), Facultad de Farmacia, Universidad Complutense, Madrid, Spain.

Revista Espanola De Fisiologia
|December 1, 1992
PubMed
Summary

The heparin-sodium citrate precipitation method for determining low-density-lipoprotein-cholesterol (LDL-C) closely correlates with the Friedewald formula. However, the precipitation method yields higher LDL-C values in hypertriglyceridemic individuals.

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Area of Science:

  • Clinical Chemistry
  • Cardiovascular Disease Biomarkers

Background:

  • Accurate determination of low-density-lipoprotein-cholesterol (LDL-C) is crucial for cardiovascular risk assessment.
  • The Friedewald formula is a widely used method for estimating LDL-C, but its accuracy can be affected by triglyceride levels.

Purpose of the Study:

  • To compare the accuracy of the heparin-sodium citrate precipitation method with the Friedewald formula for LDL-C determination.
  • To investigate the influence of hypertriglyceridemia on LDL-C measurements obtained by both methods.

Main Methods:

  • Comparative analysis of LDL-C levels using the heparin-sodium citrate precipitation method and the Friedewald formula in 187 men.
  • Paired-comparison analysis to assess the influence of serum triglyceride (Tg) levels on LDL-C results.

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Main Results:

  • Both methods showed a high correlation (r > 0.9, p < 0.001) for LDL-C determination.
  • The precipitation method resulted in 15% higher LDL-C values in hypertriglyceridemic individuals (Tg ≥ 2.3 mmol/l).
  • Friedewald's formula underestimated LDL-C in hypertriglyceridemic men, leading to 13% false hypercholesterolemia diagnoses at a 3.9 mmol/l cutoff.

Conclusions:

  • The heparin-sodium citrate precipitation method provides reliable LDL-C results comparable to the Friedewald formula in the general population.
  • The Friedewald formula may overestimate hypercholesterolemia in individuals with elevated triglycerides, highlighting the precipitation method's potential advantage in such cases.