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Authors

  1. Sardi, Adacilis Ramirez BS, MT (ASCP)
  2. Lamoureux, Julie A. DMD, MSc
  3. Cohn, Tanya M. PhD, MEd, RN
  4. Phillip-Samuel, Shirley G. BSN, RN

Abstract

Traditionally, troponin levels are measured in the blood using an automated laboratory protocol, but the use of a faster technology, the point-of-care (POC) testing of troponin levels, has shown promise in the effective differential diagnosis of cardiac injury. The purpose of this study was to compare the 2 methods. A total of 1567 patients were seen in the emergency department who were tested with both the POC iSTAT troponin and laboratory troponin from a secondary analysis of retrospective data collected between June 2012 and December 2012. The values for laboratory troponin varied between 0 and 30 with a mean and standard deviation of 0.060 +/- 0.842 and the values for POC testing varied between 0 and 17.2 with a mean and standard deviation of 0.042 +/- 0.492. The Bland-Altman analysis showed a systematic negative bias for the POC values compared with the laboratory troponin values. Lowering the POC cut-off value for troponin to 0.035 yielded 3 out of 4 better validity coefficients compared with those with the suggested manufacturer's cut-off value of 0.08 when predicting the gold standard. The POC troponin can be used to measure troponin level and similar diagnosis if the cut-off value for the POC troponin is lowered to 0.035 instead of the 0.08 suggested manufacturer's cut-off.