Comparison of phosphotungstate and dextran sulfate-Mg2+ precipitation procedures for determination of high density lipoprotein cholesterol.

Because of the controversy over the best method for assaying high density lipoprotein (HDL) cholesterol in the clinical laboratory, a commonly used phosphotungstate method for precipitating low density and very low density lipoproteins (LDL and VLDL) was compared with a recently recommended dextran sulfate precipitation method. The accuracy and precision of HDL cholesterol determinations were similar for both methods. Either of these procedures would appear to be equally satisfactory for the assay of HDL cholesterol in the clinical laboratory.

Automated turbidimetric assay of serum apolipoprotein A1 using the COBAS-BIO centrifugal analyzer.

An automated turbidimetric procedure for determining serum concentrations of apolipoprotein A1 (apo A1) is described. This procedure allows for rapid, precise and inexpensive assay of apo A1 in large numbers of serum samples.