Evaluation of the VITROS chemistry products dHDL slides for direct measurement of high density lipoprotein cholesterol.
BACKGROUND
We evaluated the new VITROS direct high density lipoprotein cholesterol (dHDL) slide assay, based on the precipitation of apolipoprotein B-containing lipoproteins by phosphotungstic acid/magnesium chloride (PTA/MgCl2).


METHODS
We determined linearity, within-run and between-run imprecision for the VITROS dHDL slide assay, and compared it to the RANDOX two-step PTA/MgCl2 method for 300 fresh sera. Moreover, triglyceride and cholesterol interference were tested.


RESULTS
The VITROS dHDL slide assay was linear from 0 to 3.13 mmol/l. Within-run and between-run imprecision were 1.6%, 1.8%, 3.3% and 3.2% for target values at 1.00 and 1.40 mmol/l, respectively. For 300 fresh serum samples, the linear regression equation between the VITROS dHDL slide assay (y) and the RANDOX PTA/MgCl2 2 method (x) was: y (mmol/l)=0.934 x+0.043 (CI=0.916-0.952 for slope and 0.017-0.069 for intercept) . The bias of the VITROS assay compared to the RANDOX PTA/MgCl2 method was less than 5% for HDL cholesterol concentrations used for medical decision (1.04 and 1.50 mmol/l). Total error remained below 13% for triglyceride and LDL cholesterol concentrations below 6.6 mmol/l.


CONCLUSIONS
The VITROS dHDL slide assay is rapid, linear over a broad range of concentrations, and satisfies the National Cholesterol Education Program goals for precision and accuracy.
Duvillard
Laurence
L
Department of Biochemistry, Hôpital du Bocage, BP 77908, 21079 Dijon Cédex, France. laurence.duvillard@chu-dijon.fr
Gambert
Philippe
P
D008076:Cholesterol, HDL / Q000097:blood*; D019963:Clinical Chemistry Tests / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008055:Lipids / Q000097:blood; D008075:Lipoproteins, HDL / Q000097:blood; D008079:Lipoproteins, VLDL / Q000097:blood; D015203:Reproducibility of Results; D014280:Triglycerides / Q000097:blood
D008076:Cholesterol, HDL; D008055:Lipids; D008075:Lipoproteins, HDL; D008079:Lipoproteins, VLDL; D014280:Triglycerides