title: Evaluation in an emergency department of rapid separator tubes containing thrombin for serum preparation prior to hs-cTnT and CK-MB analyses.
abstract: BACKGROUND
  In our emergency department, we collect blood in Rapid Serum Tubes (RSTs; Becton Dickinson, Franklin Lakes, NJ), in which clotting times are reduced. We investigated the influence of RST use on cardiac troponin T (hs-cTnT) and creatine kinase-MB (CK-MB) test results, in comparison with the use of tubes featuring a separator gel containing a clotting activator (SSTs; Green-vac, Yongin, Korea).
  
  
  METHODS
  Samples from 60 patients were divided into equal aliquots and placed into RSTs and SSTs; hs-cTnT and CK-MB concentrations were determined using an autoanalyzer (Elecsys 2010) running commercial assays (Roche Diagnostics, Penzberg, Germany). Between-tube differences in CK-MB and hs-cTnT values were compared using the paired t-test, and correlations among variables were evaluated by calculation of Spearman correlation coefficients (r values). Deming regression analysis was performed and Bland-Altman plots were constructed.
  
  
  RESULTS
  The hs-cTnT and CK-MB test results obtained from samples placed into RSTs and SSTs did not differ (p > 0.1). The correlations between the concentrations of hs-cTnT and CK-MB in samples placed into RSTs and SSTs were good; both r values were unity (p < 0.001). Deming regression analysis yielded the equation: RST [hs-cTnT] = 0.98 SST [hs-cTnT] + 0.69 pg/ml; and RST [CK-MB] = 0.95 SST [CK-MB]-0.09 ng/ml. The biases of 1.4 pg/ml (95% CI: minus 8.1-10.7 pg/ml) for hs-cTnT levels and 0.249 ng/ml (95% CI: minus 0.682-1.681 ng/ml) for CK-MB levels assayed using either tube was acceptable.
  
  
  CONCLUSIONS
  The hs-cTnT and CK-MB test results did not significantly differ when either tube was used. RST tube use was associated with a short clotting time; this was an advantage in an emergency laboratory setting.
authors.affiliation: Department of Clinical Laboratory, Sevket Yilmaz Education and Research Hospital, Sevket Yilmaz Devlet Hastanesi. Biyokimya Laboratuari. Yildirim, Bursa, Turkey.
authors.forename: Yasemin U
authors.initials: YU
authors.lastname: Budak
authors.affiliation: Department of Clinical Laboratory, Yüksek İhtisas Education and Research Hospital, Bursa, Turkey.
authors.forename: Kagan
authors.initials: K
authors.lastname: Huysal
authors.affiliation: Department of Emergency Medicine, Sevket Yilmaz Education and Research Hospital, Bursa, Turkey.
authors.forename: Mehtap
authors.initials: M
authors.lastname: Bulut
authors.affiliation: Department of General Surgery, Sevket Yilmaz Education and Training Hospital, Bursa, Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Polat
keywords: Cardiac troponin T; Creatine kinase-MB; Rapid serum tubes