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Clinical Chemistry 34: 2322-2327, 1988;
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Clinical Chemistry, Vol 34, 2322-2327, Copyright © 1988 by American Association for Clinical Chemistry

Dual-precipitation method evaluated for determination of high-density lipoprotein (HDL), HDL2, and HDL3 cholesterol concentrations

VC Dias, HG Parsons, ND Boyd and P Keane
Department of Pediatrics, University of Calgary, Alberta, Canada.

We evaluated a dual-precipitation method for determining cholesterol in high-density lipoprotein (HDL) and its subfractions HDL2 and HDL3. After total HDL was isolated by precipitation of very-low-density (VLDL) and low-density (LDL) lipoproteins with polyethylene glycol (Mr 8000), HDL2 was isolated from total HDL by precipitation with dextran sulfate (Mr 15,000), leaving HDL3 in the supernate. Concentration of total HDL cholesterol after precipitation of VLDL and LDL with PEG showed significant proportional and constant biases of -3.8% and 0.04 mmol/L, respectively, when compared with a phosphotungstic acid-based comparison method, although results by the two methods were correlated highly (r = 0.99, P less than 0.001). HDL2 and HDL3 cholesterol concentrations measured with the present technique were not different from those obtained by density-gradient ultracentrifugation or by combined precipitation-ultracentrifugation.


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