Local Calibration of International Normalised Ratio Improves between Laboratory Agreement: Results from the UK National External Quality Assessment Scheme

S. Kitchen; I. Jennings; T. A. L. Woods; F.E Preston; behalf of UK NEQAS (Blood Coagulation) Steering Committee

doi:10.1055/s-0037-1614419

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 1999; 81(01): 60-65
DOI: 10.1055/s-0037-1614419

Review Article

Schattauer GmbH

Local Calibration of International Normalised Ratio Improves between Laboratory Agreement: Results from the UK National External Quality Assessment Scheme

Authors

S. Kitchen

¹From the UK NEQAS for Blood Coagulation, Sheffield, UK
I. Jennings

¹From the UK NEQAS for Blood Coagulation, Sheffield, UK
T. A. L. Woods

¹From the UK NEQAS for Blood Coagulation, Sheffield, UK
F.E Preston

¹From the UK NEQAS for Blood Coagulation, Sheffield, UK

behalf of UK NEQAS (Blood Coagulation) Steering Committee

References
1 Loeliger EA, van den Besselaar AMHP, Broekmans AW. Intensity of oral anticoagulation in patients monitored with various thromboplastins. New E J Med 1983; 308: 1228-9.
2 WHO expert committee on biological standardisation. Thirty-third report. WHO Tech Report Series 1983; 687: 81-105.
3 Hermans J, van den Besselaar AMHP, Loeliger EA, van der Velde EA. A collaborative study of reference materials for thromboplastins. Thromb Haemost 1983; 50: 712-7.
4 Kirkwood TBL. Calibration of reference thromboplastins and standardisation of the prothrombin time ratio. Thromb Haemost 1983; 49: 238-44.
5 Kitchen S, Walker ID, Woods TAL, Preston FE. Thromboplastin related differences in the determination of International Normalised Ratio. Thromb Haemost 1994; 72: 426-9.
6 Kitchen S, Jennings I, Woods TAL, Walker ID, Preston FE. Two recombinant tissue factor reagents compared to conventional thromboplastins for determination of Internatonal Normalised Ratio: a 33-laboratory collaborative study. Thromb Haemost 1996; 76: 372-6.
7 Poggio M, van den Besselaar AMHP, van der Velde EA, Bertina RM. The effects of some instruments for PT testing on the ISI of two rabbit brain thromboplastin reagents. Thromb Haemost 1988; 62: 868-74.
8 D’Angelo A, Seveso MP, D’Angelo SV. et al. Comparison of two automated coagulometers and the manual tilt tube method for the determination of the prothrombin time. Am J Clin Path 1989; 92: 321-8.
9 Ray MJ, Smith IR. The dependence of the ISI on the coagulometer used to perform the prothrombin time. Thromb Haemost 1990; 63: 424-9.
10 Thomson JM, Taberner DA, Poller L. Automation and prothrombin time: a UK field study of two widely used coagulometers. J Clin Path 1990; 43: 679-84.
11 Houbouyan LL, Goguel Af. Long-term French experience in INR standardisation by a procedure using plasma calibrants. Am J Clin Pathol 1997; 108: 83-9.
12 Clarke K, Taberner DA, Thomson JM, Morris JS, Poller L. Assessment of value of calibrated lyophilised plasma to determine International Sensitivity Index for coagulometers. J Clin Path 1992; 42: 58-60.
13 Van den Besselaar AMHP. Use of lyophilised calibration plasmas and control blood for INR calculation in external quality assessment of the PT. Am J Clin Path 1994; 102: 123-7.
14 Poller L, Thomson JM, Taberner D, Clarke K. The correction of coagulometer effects on INRs: a multicentre evaluation. Br J Haem 1994; 86: 112-7.
15 Poller L, Triplett DA, Hirsh J, Carroll J, Clarke K. The value of plasma calibrants in correcting for coagulometer effects on INR; An international multicentre study. Am J Clin Path 1995; 103: 358-65.
16 Van den Besselaar AMHP, Bertina RM. Multicentre calibration of the secondary reference material for thromboplastin, rabbit plain, coded CRM 149R. Thromb Haemost 1991; 65: 263-7.
17 Van den Besselaar AMHP. Multicentre study of replacement of the international reference preparation for thromboplastin, rabbit plain. Thromb Haemost 1993; 70: 794-9.
18 Thomson JM, Tomenson JA, Poller L. The calibration of the second primary International reference preparation for thromboplastin (Thromboplastin, Human, Plain, coded BCT/253). Thromb Haemost 1984; 52: 336-42.
19 Haber A, Runyon RP. General Statistics. (2nd Edition). Addison-Wesley London: 1973
20 Dufty JMK, Craig S, Stevenson KJ, Taberner DA. Calculation of System International Sensitivity Index: How many calibrants are required?. J Clin Path 1997; 50: 40-4.
21 Poller L, Barrowcliffe TW, van den Besselaar AMHP, Jespersen J, Tripodi A, Houghton D. A simplified statistical method for local INR using linear regression. B J Haem 1997; 98: 640-7.
22 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 Haem 1997; 96: 435-41.
23 Van den Besselaar AMHP. Comparison of lyophilised plasmas with fresh plasma for calibration of thromboplastin reagents in oral anticoagulant control. Br J Haem 1996; 93: 437-44.