title: Comparison of three automated urinalysis systems--Bayer Clinitek Atlas, Roche Urisys 2400 and Arkray Aution Max for testing urine chemistry and detection of bacteriuria.
abstract: BACKGROUND
  Our study is aimed to determine the performance of 3 automated urinalysis systems-Clinitek Atlas, Urisys 2400 and Aution Max.
  
  
  METHODS
  One thousand urine specimens were analyzed with the 3 automated systems. The results of the 3 assays were compared for testing urine chemistry and evaluating the capacity of leukocyte esterase and nitrite to detect bacteriuria.
  
  
  RESULTS
  The correlation between the 3 instruments represented as within 1 grading difference was better between the Atlas and Aution Max systems for pH, blood, glucose, urobilinogen, ketone and specific gravity. For protein and nitrite, better correlation was observed between the Atlas and Urisys 2400, while the Aution Max and Urisys 2400 conveyed better correlation for bilirubin and white blood cells. The sensitivity and specificity of both the leukocyte esterase and nitrite in screening for significant bacteriuria were 71.7, 58.9, 70.8% and 99.1, 99.1 and 97.2%, for the Clinitek Atlas, Aution Max and Urisys 2400, respectively.
  
  
  CONCLUSIONS
  The automated urinalysis systems demonstrate acceptable correlations with each other in urine chemistries, especially between the Clinitek Atlas and Aution Max systems on the majority of items. The specificity and negative predictive value of leukocyte esterase and nitrite of the 3 instruments for screening of significant bacteriuria were sufficient to avoid unnecessary urine culture.
authors.affiliation: Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Tzu-I
authors.initials: TI
authors.lastname: Chien
authors.forename: Jin-Ying
authors.initials: JY
authors.lastname: Lu
authors.forename: Jau-Tsuen
authors.initials: JT
authors.lastname: Kao
authors.forename: Tai-Fen
authors.initials: TF
authors.lastname: Lee
authors.forename: Shu-Yuan
authors.initials: SY
authors.lastname: Ho
authors.forename: Chia-Yu
authors.initials: CY
authors.lastname: Chang
authors.forename: Chao-Wei
authors.initials: CW
authors.lastname: Liu
authors.forename: Chun-Hsien
authors.initials: CH
authors.lastname: Lee
authors.forename: Shiao-Ni
authors.initials: SN
authors.lastname: Yan
authors.forename: Jui-Yi
authors.initials: JY
authors.lastname: Yang
authors.forename: Po-Chuang
authors.initials: PC
authors.lastname: Lin
authors.forename: Mei-Ju
authors.initials: MJ
authors.lastname: Wang
mesh_terms: D001437:Bacteriuria / Q000097:blood / Q000382:microbiology / Q000652:urine*; D006801:Humans