title: Performance characteristics of the ARCHITECT Galectin-3 assay.
abstract: OBJECTIVE
  Galectin-3 is an emerging biomarker that is commonly increased in patients with heart failure and/or patients at risk for cardiovascular disease. We evaluated the Galectin-3 assay on the Abbott ARCHITECT i1000(SR) and ARCHITECT i2000(SR) at 2 testing sites.
  
  
  METHODS
  Imprecision (%CV), interference, limits of blank (LoB), detection (LoD), and quantitation (LoQ), linearity, method comparison to an ELISA method, comparisons between plasma and serum, and reference intervals were evaluated. Imprecision was performed based on two runs of duplicate testing conducted daily. Verification of LoB, LoD, and LoQ was performed according to Clinical and Laboratory Standards Institute guidelines. Linearity was evaluated by making 5 dilutions of a high patient EDTA plasma pool with a low patient pool. Reference intervals were established using EDTA plasma collected from self-reported healthy volunteers. A second lot of reagent was used at one site for method comparison and imprecision studies.
  
  
  RESULTS
  Total CV's were ≤6.0%. A positive interference was observed for hemolyzed samples over 2.0 g/L hemolysate. The LoB ranged from 0.1 to 0.3 ng/mL, the LoD from 1.4 to 2.1 ng/mL and the LoQ from 3.0 to 3.3 ng/mL. Linearity studies had slopes and correlation coefficients equal to 1.0. Comparison of the i1000(SR) and i2000(SR) to the ELISA method demonstrated slopes of 1.0 to 1.2 and correlation coefficients of 0.93 to 0.97. The 97.5th percentile of the reference interval was 18.7 and 17.9 ng/mL for the i1000(SR) and i2000(SR), respectively.
  
  
  CONCLUSIONS
  The Abbott Galectin-3 assay demonstrated acceptable analytical performance on both the ARCHITECT i1000(SR) and ARCHITECT i2000(SR).
authors.affiliation: ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT 84108, USA.
authors.forename: Sonia L
authors.initials: SL
authors.lastname: La'ulu
authors.forename: Fred S
authors.initials: FS
authors.lastname: Apple
authors.forename: Maryann M
authors.initials: MM
authors.lastname: Murakami
authors.forename: Ranka
authors.initials: R
authors.lastname: Ler
authors.forename: William L
authors.initials: WL
authors.lastname: Roberts
authors.forename: Joely A
authors.initials: JA
authors.lastname: Straseski
mesh_terms: D000328:Adult; D000368:Aged; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D037502:Galectin 3 / Q000097:blood*; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation* / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D055815:Young Adult
chemical_list: D037502:Galectin 3