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Clinical Chemistry 30: 1797-1800, 1984;
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Clinical Chemistry, Vol 30, 1797-1800, Copyright © 1984 by American Association for Clinical Chemistry

Five methods for determining low-density lipoprotein cholesterol compared

PN Demacker, AG Hijmans, BJ Brenninkmeijer, AP Jansen and A van 't Laar

We evaluated three precipitation methods for determination of low- density lipoprotein cholesterol in serum and an indirect method involving the Friedewald formula (Clin Chem 18: 499-502, 1972) by comparison with results by ultracentrifugation. The results of all methods for 83 sera, including 59 hyperlipidemic type IIA, IIB, and IV sera agreed very well, at least for concentrations of serum triglycerides below 8 mmol/L. The accuracy of the Friedewald formula was confirmed in 285 other sera, including 66 sera with triglycerides content between 4.52 and 8.0 mmol/L. For type III sera, the precipitation methods produced similar values to those obtained with the Friedewald formula, all being much higher than the ultracentrifugation values. Density-gradient ultracentrifugation showed that the very-low-density lipoprotein remnants in type III sera almost completely coprecipitated with the low-density lipoproteins. The precipitation methods are not only accurate but also very precise (CV less than 5%); they can therefore be used in clinical laboratories to measure atherogenic low-density lipoproteins plus the remnants of very- low-density lipoproteins. However, when serum triglycerides and high- density lipoprotein cholesterol also are determined, the Friedewald formula is a reliable alternative.


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