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Clinical Chemistry, Vol 41, 232-240, Copyright © 1995 by American Association for Clinical Chemistry
JR McNamara, TG Cole, JH Contois, CA Ferguson, JM Ordovas and EJ Schaefer
USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA.
Low-density lipoprotein (LDL) cholesterol can not be calculated from other lipid measurements when samples are obtained from nonfasting individuals or when triglycerides are > or = 4.0 g/L. We have evaluated a direct LDL cholesterol assay for analyzing 115 fresh serum samples obtained from fasting and nonfasting dyslipidemic patients with triglycerides < or = 35.85 g/L, who were receiving diet and (or) drug treatments. Results were highly correlated with those by ultracentrifugation (r = 0.97), with a mean/median bias of -2.9%/0.7% (- 0.001/0.010 g/L) and an absolute bias of 9.5%/6.4% (0.119/0.090 g/L). The assay correctly classified LDL cholesterol concentrations < 1.30 g/L 81% of the time, 1.30-1.60 g/L 76% of the time, and > or = 1.60 g/L 94% of the time. Precision studies provided within- and between-run CVs in the range of 1.2-3.8% and 2.0-5.1%, respectively. Our data indicate that this assay is an accurate method for measuring LDLC directly from fresh serum obtained from fasting or nonfasting subjects with a wide range of triglyceride values.
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