title: Comparison of blood glucose meters in a New Zealand diabetes centre.
abstract: BACKGROUND
  To assess the accuracy and precision of the Roche Performa and Medisense Optium Xceed (5 and 10 s reading) blood glucose meters.
  
  
  METHODS
  Capillary blood samples were taken from 100 patients attending a diabetes centre and blood glucose measured on Roche Performa (n = 4) and Medisense Optium Xceed 5 s (n = 2) and 10 s reading (n = 2) meters. Venous plasma glucose from samples taken simultaneously was measured by the laboratory hexokinase method as reference standard. Imprecision was determined on the meters by replicate analysis (n = 20) of control solutions provided by the manufacturers and also patient venous whole-blood samples. Accuracy was assessed relative to the reference method by Bland-Altman plots, Passing and Bablok regression analysis, and both Clarke and consensus error grid analysis. Coefficients of variation (CVs) were calculated to determine imprecision.
  
  
  RESULTS
  Bland-Altman and Passing-Bablok analysis confirmed significant systematic bias for all meters, with relative under-reading of higher glucose concentrations. Error grid analysis showed that <5% readings exceeded +/-20% (or +/-0.83 mmol/L for readings <4 mmol/L) deviation from the reference method (1%, 2% and 4% for the Roche, Optium 5 and 10 s meters, respectively). CVs were all <4% for the control solutions and <6% for patient samples.
  
  
  CONCLUSIONS
  Both Roche Performa and Medisense Optium glucose meters (5 and 10 s readings) perform satisfactorily and are acceptable for operational use.
authors.affiliation: Diabetes Centre, Christchurch Hospital, Christchurch, New Zealand. Chris.Florkowski@cdhb.govt.nz
authors.forename: Christopher
authors.initials: C
authors.lastname: Florkowski
authors.forename: Christopher
authors.initials: C
authors.lastname: Budgen
authors.forename: Deborah
authors.initials: D
authors.lastname: Kendall
authors.forename: Helen
authors.initials: H
authors.lastname: Lunt
authors.forename: M Peter
authors.initials: MP
authors.lastname: Moore
mesh_terms: D001786:Blood Glucose / Q000032:analysis*; D015190:Blood Glucose Self-Monitoring / Q000295:instrumentation*; D003920:Diabetes Mellitus / Q000097:blood*; D003922:Diabetes Mellitus, Type 1 / Q000097:blood; D003924:Diabetes Mellitus, Type 2 / Q000097:blood; D006801:Humans; D009520:New Zealand
chemical_list: D001786:Blood Glucose