title: Comparison of iSED and Ves-Matic Cube 200 Erythrocyte Sedimentation Rate Measurements With Westergren Method.
abstract: BACKGROUND
  The erythrocyte sedimentation rate (ESR) test is performed widely in laboratories. Besides the traditional Westergren method, new methods have been developed for ESR measurements. We aimed to compare the instruments using new methods, iSED (Alcor Scientific) and Ves-Matic Cube 200 (Diesse Diagnostica Senese, Italy) with the Westergren method.
  
  
  METHODS
  Blood samples from 136 patients were taken into EDTA tubes for automated analyzers and citrated tubes for Westergren method. Patients were divided into three groups- low, medium, and high-according to their sedimentation rates. Precision, stability, and interference studies of the methods were performed.
  
  
  RESULTS
  The iSED sedimentation method (n = 136) yielded a slope of (0.61-0.84), with an intercept of (-2.32 to 1.89), which resulted in a mean bias of 13; and the Ves-Matic Cube 200 method (n = 136) yielded a slope of (0.85-1.00), with an intercept of (0.00-3.07), which resulted in a mean bias of 1.4 in Passing-Bablok regression analysis compared to the reference method.
  
  
  CONCLUSIONS
  iSED sedimentation showed a poor correlation and a high bias (>10%) with the Westergren method, and Ves-Matic Cube 200 method showed a higher correlation and a lower bias than the iSED device when compared with Westergren reference method. These instruments should be carefully monitored.
authors.affiliation: Clinical Biochemistry Laboratory, Ankara Numune Education and Research Hospital, Ankara, Turkey.
authors.forename: Nihal
authors.initials: N
authors.lastname: Boğdaycioğlu
authors.affiliation: Clinical Biochemistry Laboratory, Ankara Numune Education and Research Hospital, Ankara, Turkey.|Clinical Biochemistry Department, Yıldırım Beyazıt University Medical Faculty, Ankara, Turkey.
authors.forename: Fatma Meric
authors.initials: FM
authors.lastname: Yilmaz
authors.affiliation: Clinical Biochemistry Laboratory, Ankara Numune Education and Research Hospital, Ankara, Turkey.
authors.forename: Sevilay
authors.initials: S
authors.lastname: Sezer
authors.affiliation: Clinical Biochemistry Laboratory, Ankara Numune Education and Research Hospital, Ankara, Turkey.
authors.forename: Esra
authors.initials: E
authors.lastname: Oğuz
mesh_terms: D001799:Blood Sedimentation; D001800:Blood Specimen Collection; D005260:Female; D006403:Hematologic Tests / Q000379:methods* / Q000592:standards*; D006801:Humans; D008297:Male; D011446:Prospective Studies; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric
keywords: Citrate; EDTA; Erythrocyte sedimentation rate; Ves-Matic Cube 200; Westergren; iSED