International Normalized Ratio: Towards Improved Accuracy

A. M. H. P. van den Besselaar

doi:10.1055/s-0037-1614878

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 1999; 82(06): 1562-1563
DOI: 10.1055/s-0037-1614878

Commentaries

Schattauer GmbH

International Normalized Ratio: Towards Improved Accuracy

A. M. H. P. van den Besselaar

¹From the Hemostasis and Thrombosis Research Center, Department of Hematology, Leiden University Medical Center,Leiden, The Netherlands

› Author Affiliations

Abstract

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References

References
1 Duncan EM, Casey CR, Duncan BM, Lloyd JV. Effect of concentration of trisodium citrate anticoagulant on calculation of the international normalised ratio and the international sensitivity index of thromboplastin. Thromb Haemost 1994; 72: 84-8.
2 Chantarangkul V, Tripodi A, Clerici M, Negri B, Mannucci PM. Assessment of the influence of citrate concentration on the international normalized ratio (INR) determined with twelve reagent-instrument combinations. Thromb Haemost 1998; 80: 258-62.
3 Van den Besselaar AMHP, Meeuwisse-Braun J, Witteveen E, van Meegen E. Effect of evacuated blood collection tubes on thromboplastin calibration. Thromb Haemost 1998; 79: 1062-3.
4 Thomson JM, Taberner DA, Poller L. Automation and prothrombin time: a United Kingdom field study of two widely used coagulometers. J Clin Pathol 1990; 43: 679-84.
5 Poller L, Triplett DA, Hirsh J, Carroll J, Clarke K. The value of plasma calibrants in correcting coagulometer effects on international normalized ratios. Am J Clin Pathol 1995; 103: 358-65.
6 Hubbard AR, Margetts SML, Barrowcliffe TW. International normalized ratio determination using calibrated reference plasmas. Br J Haematol 1997; 98: 74-8.
7 Houbouyan LL, Goguel AF. Long-term French experience in INR standardization by a procedure using plasma calibrants. Am J Clin Pathol 1997; 108: 83-9.
8 Chantarangkul V, Tripodi A, Cesana BM, Mannucci PM. Calibration of local systems with lyophilized calibrant plasmas improves the interlaboratory variability of the INR in the Italian external quality assessment scheme. Thromb Haemost 1999; 82: 1621-6.
9 Stevenson KJ, Craig S, Dufty JMK, Taberner DA. System ISI calibration: a universally applicable scheme is possible only when coumarin plasma calibrants are used. Br J Haematol 1997; 96: 435-41.
10 Johnston M, Adcock D. The use of frozen plasma calibrants to standardize the international normalized ratio (INR). Thromb Haemost 1999; 82 (Suppl) 544.
11 Hubbard AR, Margetts SM, Weller LJ, Macnab J, Barrowcliffe TW. An international collaborative study on the INR calibration of freeze-dried reference plasmas. Br J Haematol 1999; 104: 455-60.
12 Poller L, van den Besselaar AMHP, Jespersen J, Tripodi A, Houghton D. The importance of “like-to-like” calibrations with freeze-dried plasmas. J Clin Pathol 1998; 51: 275-9.
13 Van den Besselaar AMHP. Field study of lyophilised plasmas for local prothrombin time calibration in the Netherlands. J Clin Pathol 1997; 50: 371-4.
14 Janson T, Tanbergmoen I, Brynildsrud T. Lyophilized plasma calibrators with PT reagent specific INR values. Thromb Haemost 1999; 82 (Suppl) 86.
15 Kitchen S, Jennings I, Woods TAL, Preston FE. Local calibration of international normalised ratio improves between laboratory agreement: results from the UK national external quality assessment scheme. Thromb Haemost 1999; 81: 60-5.