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Comparative study of LDL-cholesterol levels in Thai patients by the direct method and using the Friedewald formula

Thirawuth Teerakanchana1, Wilai Puavilai, Kanjana Suriyaprom

  • 1Clinical Chemistry Laboratory, Department of Clinical Pathology, Rajavithi Hospital, Ministry of Public Health, Bangkok, Thailand.

The Southeast Asian Journal of Tropical Medicine and Public Health
|September 20, 2007
PubMed

Insights

Direct LDL-C measurement is reliable for hyperlipidemic patients. The Friedewald formula shows variable performance with differing triglyceride levels, impacting LDL-C estimation accuracy.

Area of Science:

  • Clinical Chemistry
  • Cardiovascular Diagnostics

Background:

  • Accurate low-density lipoprotein cholesterol (LDL-C) measurement is crucial for managing hyperlipidemia and cardiovascular risk.
  • The Friedewald formula is a common method for estimating LDL-C, but its accuracy can be affected by triglyceride (TG) levels.

Purpose of the Study:

  • To compare the accuracy of directly measured LDL-C with LDL-C estimated by the Friedewald formula in a Thai patient cohort.
  • To evaluate the performance consistency of the Friedewald formula across different triglyceride concentration ranges.

Main Methods:

  • A comparative study involving 1,016 Thai outpatients.
  • Analysis of blood samples for total cholesterol (TC), LDL-C, HDL-C, and TG.
  • Linear regression analysis to assess the correlation between direct LDL-C and Friedewald-estimated LDL-C.

Main Results:

  • A highly significant correlation (p<0.001) was observed between direct LDL-C and Friedewald-estimated LDL-C.
  • The Friedewald formula exhibited variable bias across different TG levels (e.g., 18.3 mg/dl for 151-200 mg/dl TG, 11.4 mg/dl for 201-300 mg/dl TG, 20.9 mg/dl for 301-400 mg/dl TG).
  • Direct LDL-C assay met established analytical performance targets.

Conclusions:

  • Direct LDL-C measurement is a reliable method for diagnosing and managing hyperlipidemic patients.
  • The Friedewald formula's performance in estimating LDL-C is not homogeneous and is significantly influenced by varying triglyceride levels.

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