title: Evaluation of four automated high-sensitivity C-reactive protein methods: implications for clinical and epidemiological applications.
abstract: BACKGROUND
  C-reactive protein (CRP) can provide prognostic information about the risk of developing atherosclerotic complications in apparently healthy patients. This new clinical application requires quantification of CRP concentrations below those traditionally measured in the clinical laboratory.
  
  
  METHODS
  The Dade Behring BN II, the Abbott IMx, the Diagnostic Products Corporation IMMULITE, and the Beckman Coulter IMMAGE are four automated analyzers with high-sensitivity CRP (hs-CRP) methods. We evaluated these assays for precision, linearity, and comparability with samples from 322 apparently healthy blood donors.
  
  
  RESULTS
  The imprecision (CV) of the BN II, IMx, IMMULITE, and IMMAGE methods was < or = 7.6%, < or = 12%, < or = 9.8%, and < or = 9.7% at 3.5 mg/L, respectively. The BN II, IMx, IMMULITE, and IMMAGE methods were linear down to < or = 0.30, < or = 0.32, < or = 0.85, and 2.26 mg/L, respectively. CRP concentrations demarcating each quartile in a healthy population were method dependent. The IMx method gave results comparable to the BN II method for values in the reference interval. The IMMULITE method had a positive intercept compared with the BN II method. The IMMAGE method demonstrated more scatter and a positive intercept compared with the BN II method, which may reflect the fact that it is a less sensitive assay.
  
  
  CONCLUSIONS
  The four hs-CRP methods exhibited differences in results for a healthy population. Additional standardization efforts are required to ensure that hs-CRP results can be related to large-scale epidemiologic studies.
authors.affiliation: Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT 84132, USA. william.roberts@arup-lab.com
authors.forename: W L
authors.initials: WL
authors.lastname: Roberts
authors.forename: R
authors.initials: R
authors.lastname: Sedrick
authors.forename: L
authors.initials: L
authors.lastname: Moulton
authors.forename: A
authors.initials: A
authors.lastname: Spencer
authors.forename: N
authors.initials: N
authors.lastname: Rifai
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001161:Arteriosclerosis / Q000097:blood / Q000175:diagnosis; D001322:Autoanalysis; D001782:Blood Donors; D002097:C-Reactive Protein / Q000032:analysis*; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008163:Luminescent Measurements; D008297:Male; D008875:Middle Aged; D009391:Nephelometry and Turbidimetry; D011379:Prognosis; D012016:Reference Values; D012680:Sensitivity and Specificity
chemical_list: D002097:C-Reactive Protein