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References

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    van den Besselaar AMHP, Barrowcliffe TW, Houbouyan-Reveillard LL, Jespersen J, Johnston M, Poller L, Tripodi A, on behalf of the Subcommittee on Control of Anticoagulation of the Scientific and Standardization Committee of the ISTH. Guidelines on preparation, certification, and use of certified plasmas for ISI calibration and INR determination. J Thromb Haemost 2004; 2: 194653.
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    Clinical and Laboratory Standards Institute. Procedures for validation of INR and local calibration of PT/INR Systems. Approved Guideline 2005. CLSI document H54-A.
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    Favaloro EJ, Adcock DM. Standardization of the INR: how good is your laboratory’s INR and can it be improved? Semin Thromb Hemost 2008; 34: 593603.
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    Clinical and Laboratory Standards Institute. Characterization and qualification of commutable reference materials for laboratory medicine; Approved Guideline 2010. CLSI document C53-A.
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    Poller L, Keown M, Ibrahim S, van den Besselaar AMHP, Roberts C, Stevenson K, Tripodi A, Pattison A, Jespersen J, on behalf of European Concerted Action on Anticoagulation. Comparison of local international sensitivity index calibration and ‘direct INR’ methods in correction of locally reported international normalized ratios: an international study. J Thromb Haemost 2007; 5: 10029.
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    WHO Expert Committee on Biological Standardization. Guidelines for Thromboplastins and Plasma used to Control Oral Anticoagulant Therapy. WHO Technical report Series no. 889. Geneva: WHO, 1999: 6493.
  • 7
    Poller L, Ibrahim S, Pattison A, Jespersen J, European Action on Anticoagulation (EAA), formerly European Concerted Action on Anticoagulation. INR derivation with the PT/INR line simplified using a spreadsheet from the world wide web. J Clin Pathol 2011; 64: 9302.