European Concerted Action on Anticoagulation (ECAA): An assessment of a method for ISI calibration of two whole blood point-of-care PT monitor systems based on lyophilized plasmas using whole blood equivalent PT

L. Poller, M. Keown, N. Chauhan, A. M H P Van Den Besselaar, A. Tripodi, C. Shiach, J. Jespersen

Research output: Contribution to journalArticle

Abstract

Previously, the attempt to simplify the International Sensitivity Index (ISI) calibration of the CoaguChek Mini whole blood point-of-care test prothrombin time (PT) monitor system was successful using lyophilized plasmas from coumar-in-treated patients but not with lyophilized artificially depleted plasmas. With the TAS PT-NC monitor system, both types of plasma failed to provide reliable calibrations. The present study assesses a procedure for the ISI calibration of a TAS PT-NC and CoaguChek Mini whole blood point-of-care test PT monitor systems using lyophilized plasmas. Using lyophilized artificially depleted and coumarin plasma calibrations, we have evaluated a correction for the monitor displayed PT. This was based on a 'line of equivalence' derived from the relationship between whole blood and fresh plasma PT with both types of monitor system. With the TAS PT-NC, the use of this 'line of equivalence' resulted in reliable ISI with both lyophilized coumarin and artificially depleted plasmas. There was no significant difference between mean monitor and mean reference International Normalized Ratio (INR) with the artificially depleted plasmas. With the lyophilized coumarin plasma calibrations there was only a small INR difference. Correction with the 'line of equivalence' therefore facilitates calibration of the TAS PT-NC with lyophilized plasmas. With the CoaguChek Mini, the correction based on the 'line of equivalence' did not improve results but was not required with this system.

Original languageEnglish
Pages (from-to)766-772
Number of pages7
JournalJournal of Thrombosis and Haemostasis
Volume1
Issue number4
DOIs
Publication statusPublished - Apr 2003

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Keywords

  • Lyophilized plasma calibrations
  • Multicentre International Sensitivity Index (ISI)
  • Point-of-care test (POCT) monitors

ASJC Scopus subject areas

  • Hematology
  • Medicine(all)

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