Use of a dual-precipitation procedure for measuring high-density lipoprotein 3 (HDL3) in normolipidemic serum.
We compared results by a dual-precipitation method (J Lipid Res 1982;23:1206-23) for measuring high-density lipoprotein 3 (HDL3) cholesterol with those by ultracentrifugation at d 1.125, using 56 fresh and 105 frozen-stored serum samples. For both methods, HDL2-cholesterol was calculated as the difference between total HDL-cholesterol and HDL3-cholesterol. In general, for pooled serum samples, agreement was closest with ultracentrifugation when we used a dextran sulfate concentration of 5.0 mg/L to precipitate the HDL2-rich fraction, although the optimal concentration varied from 3.0 to 6.8 mg/L for different pools. For individual samples, the values for HDL3 by dual precipitation averaged 12.8% lower than by ultracentrifugation. The coefficients of correlation between the two methods were HDL3, r = 0.70; and HDL2, r = 0.92. The dual-precipitation method reflected the expected sex-related differences in HDL2-cholesterol concentration and inverse relationship with triglyceride concentration.
Department of Pediatrics, Johns Hopkins University, School of Medicine, Baltimore, MD 21205.
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Bachorik
D000328:Adult; D011232:Chemical Precipitation; D008076:Cholesterol, HDL / Q000097:blood; D005260:Female; D006801:Humans; D008075:Lipoproteins, HDL / Q000097:blood*; D008297:Male; D012737:Sex Factors; D014280:Triglycerides / Q000097:blood; D014461:Ultracentrifugation
D008076:Cholesterol, HDL; D008075:Lipoproteins, HDL; D014280:Triglycerides