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Szederjesi A, Baronciani L, Budde U, Castaman G, Lawrie AS, Liu Y, Montgomery R, Peyvandi F, Schneppenheim R, Várkonyi A, Patzke J, Bodó I. An international collaborative study to compare different von Willebrand factor glycoprotein Ib binding activity assays: the COMPASS-VWF study. J Thromb Haemost 2018; 16:1604-1613. [PMID: 29897666 PMCID: PMC6292779 DOI: 10.1111/jth.14206] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Indexed: 01/25/2023]
Abstract
Essentials New VWF activity assays are increasingly used but information on their comparability is limited. This is an ISTH SSC-organized study (expert labs, 5 countries) to compare all available assays. VWF activity by six assays correlated well with each other. The new assays show improved characteristics - minor differences are noted. SUMMARY: Background Several new assays have become available to measure von Willebrand factor (VWF) activity. The new assays appear to have improved performance characteristics compared with the old reference standard, ristocetin cofactor activity (VWF:RCo), but information is limited about how they compare with VWF:RCo and each other. Methods The von Willebrand factor Subcommittee of the International Society for Thrombosis and Haemostasis (ISTH) Scientific and Standardization Committee (SSC) designed a collaborative study involving expert laboratories from several countries to compare available tests with each other and with VWF:RCo. Eight laboratories from five countries were provided with blinded samples from normal healthy individuals and well-characterized clinical cases. Laboratories measured VWF activity using all tests available to them; data from six laboratories, not affected by thawing during transportation, are included in this study. Results All tests correlated well with VWF:RCo activity (r-values ranged from 0.963 to 0.989). Slightly steeper regression lines for VWF:Ab and VWF:GPIbM were clinically insignificant. The new assays showed improved performance characteristics. Of the commercially available assays, the VWF:GPIbR using the AcuStar system was the most sensitive and could reliably detect VWF activity below 1 IU dL-1 . The lower limit of the measuring interval for the VWF:GPIbM and the VWF:GPIbR assays was in the 3-4 and 3-6 IU dL-1 range, respectively. Inter-laboratory variation was also improved for most new assays. Conclusion All VWF activity assays correlated well with each other and the VWF:RCo assay. The slight differences in characteristics found in the COMPASS-VWF study will assist the VWF community in interpreting and comparing activity results.
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Affiliation(s)
- A Szederjesi
- Szent István and Szent László Hospital, Budapest, Hungary
| | - L Baronciani
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, A. Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - U Budde
- Laboratory of Hemostasis, University Hospital Hamburg, Hamburg, Germany
| | - G Castaman
- Center for Bleeding Disorders, Careggi University Hospital, Florence, Italy
| | - A S Lawrie
- Haemostasis Research Unit, University College London, London, UK
| | - Y Liu
- Winship Cancer Institute, Emory University, Atlanta, GA, USA
| | - R Montgomery
- MFRC, Medical College of Wisconsin, Milwaukee, WI, USA
| | - F Peyvandi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, A. Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - R Schneppenheim
- University Medical Center, Hamburg-Eppendorf, Hamburg, Germany
| | - A Várkonyi
- Szent István and Szent László Hospital, Budapest, Hungary
| | - J Patzke
- Department of Assay Development, Siemens Healthcare Diagnostics Products GmbH, Marburg, Germany
| | - I Bodó
- Szent István and Szent László Hospital, Budapest, Hungary
- Winship Cancer Institute, Emory University, Atlanta, GA, USA
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van den Besselaar AMHP, Chantarangkul V, Angeloni F, Binder NB, Byrne M, Dauer R, Gudmundsdottir BR, Jespersen J, Kitchen S, Legnani C, Lindahl TL, Manning RA, Martinuzzo M, Panes O, Pengo V, Riddell A, Subramanian S, Szederjesi A, Tantanate C, Herbel P, Tripodi A. International collaborative study for the calibration of proposed International Standards for thromboplastin, rabbit, plain, and for thromboplastin, recombinant, human, plain. J Thromb Haemost 2018; 16:142-149. [PMID: 29065247 DOI: 10.1111/jth.13879] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Indexed: 11/28/2022]
Abstract
Essentials Two candidate International Standards for thromboplastin (coded RBT/16 and rTF/16) are proposed. International Sensitivity Index (ISI) of proposed standards was assessed in a 20-centre study. The mean ISI for RBT/16 was 1.21 with a between-centre coefficient of variation of 4.6%. The mean ISI for rTF/16 was 1.11 with a between-centre coefficient of variation of 5.7%. SUMMARY Background The availability of International Standards for thromboplastin is essential for the calibration of routine reagents and hence the calculation of the International Normalized Ratio (INR). Stocks of the current Fourth International Standards are running low. Candidate replacement materials have been prepared. This article describes the calibration of the proposed Fifth International Standards for thromboplastin, rabbit, plain (coded RBT/16) and for thromboplastin, recombinant, human, plain (coded rTF/16). Methods An international collaborative study was carried out for the assignment of International Sensitivity Indexes (ISIs) to the candidate materials, according to the World Health Organization (WHO) guidelines for thromboplastins and plasma used to control oral anticoagulant therapy with vitamin K antagonists. Results Results were obtained from 20 laboratories. In several cases, deviations from the ISI calibration model were observed, but the average INR deviation attributabled to the model was not greater than 10%. Only valid ISI assessments were used to calculate the mean ISI for each candidate. The mean ISI for RBT/16 was 1.21 (between-laboratory coefficient of variation [CV]: 4.6%), and the mean ISI for rTF/16 was 1.11 (between-laboratory CV: 5.7%). Conclusions The between-laboratory variation of the ISI for candidate material RBT/16 was similar to that of the Fourth International Standard (RBT/05), and the between-laboratory variation of the ISI for candidate material rTF/16 was slightly higher than that of the Fourth International Standard (rTF/09). The candidate materials have been accepted by WHO as the Fifth International Standards for thromboplastin, rabbit plain, and thromboplastin, recombinant, human, plain.
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Affiliation(s)
- A M H P van den Besselaar
- Department of Thrombosis and Hemostasis, and Coagulation Reference Laboratory, Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | | | - F Angeloni
- Hemostasis Reference Laboratory, Hamilton, Canada
| | | | - M Byrne
- National Coagulation Laboratory, St James's Hospital, Dublin, Ireland
| | - R Dauer
- Haematology Laboratory, Pathology Department, Alfred Health, Melbourne, Australia
| | - B R Gudmundsdottir
- Department of Laboratory Hematology and Hemostasis Center, Landspitali University Hospital and University of Iceland School of Medicine, Reykjavik, Iceland
| | - J Jespersen
- Department of Clinical Biochemistry, Hospital of South West Jutland and Unit for Health Promotion Research, Institute of Public Health, University of Southern Denmark, Esbjerg, Denmark
| | - S Kitchen
- Sheffield Haemophilia and Thrombosis Centre, Royal Hallamshire Hospital, Sheffield, UK
| | - C Legnani
- Department of Angiology and Blood Coagulation, University Hospital S. Orsola-Malpighi, Bologna, Italy
| | - T L Lindahl
- Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - R A Manning
- Department of Coagulation, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - M Martinuzzo
- Grupo Bioquímico, Laboratorio Central del Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - O Panes
- Department of Hematology-Oncology, School of Medicine, Pontifical Catholic University of Chile, Santiago, Chile
| | - V Pengo
- Clinical Cardiology, Department of Cardiac, Thoracic, and Vascular Sciences, University of Padova, Padova, Italy
| | - A Riddell
- Haemophilia Laboratory (HSL), Katharine Dormandy Haemophilia and Thrombosis Centre, Royal Free Hospital, London, UK
| | - S Subramanian
- Department of Transfusion Medicine and Immunohaematology, St John's Medical College Hospital, Bangalore, India
| | - A Szederjesi
- Hemostasis Laboratory, St István and St László Hospital, Budapest, Hungary
| | - C Tantanate
- Department of Clinical Pathology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - P Herbel
- Roche Diagnostics GmbH Mannheim, Mannheim, Germany
| | - A Tripodi
- Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Department of Clinical Sciences and Community Health, Università degli Studi di Milano and IRCCS Cà Granda Maggiore Hospital Foundation, Milano, Italy
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