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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter / Tate, Jillian R.

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Volume 39, Issue 5 (Jun 2001)


The Friedewald Formula Underestimates LDL Cholesterol at low Concentrations

Hubert Scharnagl / Matthias Nauck / Heinrich Wieland / Winfried März
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.2001.068


Due to recent advances in the treatment of hypercholesterolemia, low density lipoprotein (LDL) cholesterol concentrations below 2.6 mmol/l have become attainable. In general, LDL cholesterol is determined indirectly according to Friedewald. We examined the performance of the Friedewald formula at low concentrations of LDL cholesterol in comparison with a β-quantification method. We analyzed 176 samples from individuals treated by LDL apheresis with a mean LDL cholesterol concentration of 3.07 mmol/l and found that the Friedewald formula underestimated LDL cholesterol with a bias of −18.5%, −14.5%, −7.3%, and −3.8% at mean LDL cholesterol levels of 1.58, 2.4, 3.49, and 4.67 mmol/l, respectively. Thus, the lower the LDL cholesterol concentration was, the greater the negative bias. We conclude that the Friedewald formula may not be reliable at low LDL cholesterol concentrations produced by LDL apheresis. This finding may also be of relevance to the monitoring of patients being treated with lipid lowering drugs.

About the article

Published Online: 2005-06-01

Published in Print: 2001-06-06

Citation Information: Clinical Chemistry and Laboratory Medicine, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2001.068. Export Citation

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