title: Reference intervals for plasma apolipoprotein B determined with a standardized commercial immunoturbidimetric assay: results from the Framingham Offspring Study.
abstract: We evaluated a commercially available, standardized immunoturbidimetric assay for apolipoprotein (apo) B, the protein constituent of low-density lipoprotein (LDL), to establish reference ranges for men and women, and to determine the concentrations associated with increased risk of coronary heart disease (CHD). The between-run CV for assay of a normal-concentration control for this assay was 6.60%. The mean (+/-SD) apo B concentration was 1.03 +/- 0.24 g/L in 1880 men, significantly higher than the mean for 1944 women (0.96 +/- 0.26 g/L) participating in cycle 4 of the Framingham Offspring Study (P<0.001). An apo B value of 1.20 g/L corresponded roughly to the 75th percentile in men, similar to an LDL cholesterol concentration of 1.60 g/L, and subjects with concentrations greater than this were significantly more likely to have CHD than subjects with apo B concentrations less than 1.00 g/L, the approximate 50th percentile (P<0.05 in men and P<0.001 in women).
authors.affiliation: Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA 02111, USA.
authors.forename: J H
authors.initials: JH
authors.lastname: Contois
authors.forename: J R
authors.initials: JR
authors.lastname: McNamara
authors.forename: C J
authors.initials: CJ
authors.lastname: Lammi-Keefe
authors.forename: P W
authors.initials: PW
authors.lastname: Wilson
authors.forename: T
authors.initials: T
authors.lastname: Massov
authors.forename: E J
authors.initials: EJ
authors.lastname: Schaefer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001055:Apolipoproteins B / Q000097:blood*; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D003327:Coronary Disease / Q000097:blood; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D009391:Nephelometry and Turbidimetry; D012016:Reference Values; D012307:Risk Factors; D012680:Sensitivity and Specificity; D012727:Sex Characteristics
chemical_list: D001055:Apolipoproteins B; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL