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Katharine A Downes - One of the best experts on this subject based on the ideXlab platform.
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pretransfusion testing practices in north america 2005 2010 an analysis of the college of american pathologists Interlaboratory Comparison program j survey data 2005 2010
Archives of Pathology & Laboratory Medicine, 2012Co-Authors: Katharine A Downes, Ira A ShulmanAbstract:Context.—Data collection and analysis of the College of American Pathologists (CAP) Interlaboratory Comparison Program (Proficiency Testing) J-Survey results provide insights into North American pretransfusion compatibility testing practices and trends. Objectives.—To assess current North American manual testing practices for ABO grouping, rhesus (Rh) typing, antibody screening, and crossmatching using CAP proficiency testing data. Design.—Analysis of the CAP Interlaboratory Comparison Program J-Survey data (2005–2010) to identify laboratory methods used for ABO grouping, Rh typing, antibody screening, and crossmatching. Data were analyzed by test method using Microsoft (Redmond, Washington) Excel software. Results.—The method used most often in ABO grouping and Rh typing was tube testing. Many laboratories also used tube testing for antibody detection and crossmatching, but during the study period, the proportion of laboratories using gel-based methodologies increased considerably. Conclusions.—Most Nort...
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north american pretransfusion testing practices 2001 2004 results from the college of american pathologists Interlaboratory Comparison program survey data 2001 2004
Archives of Pathology & Laboratory Medicine, 2009Co-Authors: Ira A Shulman, Lieta M Maffei, Katharine A DownesAbstract:Abstract Context.—Pretransfusion testing of whole blood and red blood cell recipients is regulated by the federal government under the authority of the Clinical Laboratory Improvement Amendments of 1988. Regulated tests include determination of ABO group, Rh D type, antibody detection, antibody identification, and crossmatching. A wide variety of methods and reagents are available for these regulated tests. During 2001–2004, the College of American Pathologists (CAP) Interlaboratory Comparison Program (Proficiency Testing) J-Survey collected data from more than 4000 laboratories regarding their pretransfusion testing practices. Those data are presented in this report. Objective.—To assess current testing practices for ABO grouping, Rh D typing, antibody detection, and crossmatching in North America. Design.—Data collected for the CAP Interlaboratory Comparison Program (Proficiency Testing) J-Survey were analyzed for trends in laboratory testing practice during 2001– 2004. The data were grouped for analysi...
Ira A Shulman - One of the best experts on this subject based on the ideXlab platform.
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pretransfusion testing practices in north america 2005 2010 an analysis of the college of american pathologists Interlaboratory Comparison program j survey data 2005 2010
Archives of Pathology & Laboratory Medicine, 2012Co-Authors: Katharine A Downes, Ira A ShulmanAbstract:Context.—Data collection and analysis of the College of American Pathologists (CAP) Interlaboratory Comparison Program (Proficiency Testing) J-Survey results provide insights into North American pretransfusion compatibility testing practices and trends. Objectives.—To assess current North American manual testing practices for ABO grouping, rhesus (Rh) typing, antibody screening, and crossmatching using CAP proficiency testing data. Design.—Analysis of the CAP Interlaboratory Comparison Program J-Survey data (2005–2010) to identify laboratory methods used for ABO grouping, Rh typing, antibody screening, and crossmatching. Data were analyzed by test method using Microsoft (Redmond, Washington) Excel software. Results.—The method used most often in ABO grouping and Rh typing was tube testing. Many laboratories also used tube testing for antibody detection and crossmatching, but during the study period, the proportion of laboratories using gel-based methodologies increased considerably. Conclusions.—Most Nort...
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north american pretransfusion testing practices 2001 2004 results from the college of american pathologists Interlaboratory Comparison program survey data 2001 2004
Archives of Pathology & Laboratory Medicine, 2009Co-Authors: Ira A Shulman, Lieta M Maffei, Katharine A DownesAbstract:Abstract Context.—Pretransfusion testing of whole blood and red blood cell recipients is regulated by the federal government under the authority of the Clinical Laboratory Improvement Amendments of 1988. Regulated tests include determination of ABO group, Rh D type, antibody detection, antibody identification, and crossmatching. A wide variety of methods and reagents are available for these regulated tests. During 2001–2004, the College of American Pathologists (CAP) Interlaboratory Comparison Program (Proficiency Testing) J-Survey collected data from more than 4000 laboratories regarding their pretransfusion testing practices. Those data are presented in this report. Objective.—To assess current testing practices for ABO grouping, Rh D typing, antibody detection, and crossmatching in North America. Design.—Data collected for the CAP Interlaboratory Comparison Program (Proficiency Testing) J-Survey were analyzed for trends in laboratory testing practice during 2001– 2004. The data were grouped for analysi...
Diane Buerge - One of the best experts on this subject based on the ideXlab platform.
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toward the standardization of biochar analysis the cost action td1107 Interlaboratory Comparison
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Hans Jorg Bachmann, Thomas D Bucheli, Alba Dieguezalonso, Daniele Fabbri, Heike Knicker, Hanspeter Schmidt, Axel Ulbricht, Roland Becker, Alessandro Buscaroli, Diane BuergeAbstract:Biochar produced by pyrolysis of organic residues is increasingly used for soil amendment and many other applications. However, analytical methods for its physical and chemical characterization are yet far from being specifically adapted, optimized, and standardized. Therefore, COST Action TD1107 conducted an Interlaboratory Comparison in which 22 laboratories from 12 countries analyzed three different types of biochar for 38 physical–chemical parameters (macro- and microelements, heavy metals, polycyclic aromatic hydrocarbons, pH, electrical conductivity, and specific surface area) with their preferential methods. The data were evaluated in detail using professional Interlaboratory testing software. Whereas intralaboratory repeatability was generally good or at least acceptable, Interlaboratory reproducibility was mostly not (20% < mean reproducibility standard deviation < 460%). This paper contributes to better comparability of biochar data published already and provides recommendations to improve and h...
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Toward the Standardization of Biochar Analysis: The COST Action TD1107 Interlaboratory Comparison
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Hans Jorg Bachmann, Thomas D Bucheli, Daniele Fabbri, Heike Knicker, Hanspeter Schmidt, Axel Ulbricht, Roland Becker, Alessandro Buscaroli, Alba Dieguez-alonso, Diane BuergeAbstract:Biochar produced by pyrolysis of organic residues is increasingly used for soil amendment and many other applications. However, analytical methods for its physical and chemical characterization are yet far from being specifically adapted, optimized, and standardized. Therefore, COST Action TD1107 conducted an Interlaboratory Comparison in which 22 laboratories from 12 countries analyzed three different types of biochar for 38 physical−chemical parameters (macro- and microelements, heavy metals, polycyclic aromatic hydrocarbons, pH, electrical conductivity, and specific surface area) with their preferential methods. The data were evaluated in detail using professional Interlaboratory testing software. Whereas intralaboratory repeatability was generally good or at least acceptable, Interlaboratory reproducibility was mostly not (20% < mean reproducibility standard deviation < 460%). This paper contributes to better comparability of biochar data published already and provides recommendations to improve and harmonize specific methods for biochar analysis in the future.
Pieter Vermeesch - One of the best experts on this subject based on the ideXlab platform.
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Interlaboratory Comparison of cosmogenic 21ne in quartz
Quaternary Geochronology, 2015Co-Authors: Pieter Vermeesch, Greg Balco, Pierrehenri Blard, Tibor Dunai, Florian Kober, Samuel Niedermann, David L Shuster, Stefan StraskyAbstract:We performed an Interlaboratory Comparison study with the aim to determine the accuracy of cosmogenic 21Ne measurements in quartz. CREU-1 is a natural quartz standard prepared from amalgamated vein clasts which were crushed, thoroughly mixed, and sieved into 125–250 μm and 250–500 μm size fractions. 50 aliquots of CREU-1 were analyzed by five laboratories employing six different noble gas mass spectrometers. The released gas contained a mixture of 16–30% atmospheric and 70–84% non-atmospheric (predominantly cosmogenic) 21Ne, defining a linear array on the 22Ne/20Ne-21Ne/20Ne three isotope diagram with a slope of 1.108 ± 0.014. The internal reproducibility of the measurements is in good agreement with the formal analytical precision for all participating labs. The external reproducibility of the 21Ne concentrations between labs, however, is significantly overdispersed with respect to the reported analytical precision. We report an average reference concentration for CREU-1 of 348 ± 10 × 106 at [21Ne]/g[SiO2], and suggest that the 7.1% (2σ) overdispersion of our measurements may be representative of the current accuracy of cosmogenic 21Ne in quartz. CREU-1 was tied to CRONUS-A, which is a second reference material prepared from a sample of Antarctic sandstone. We propose a reference value of 320 ± 11 × 106 at/g for CRONUS-A. The CREU-1 and CRONUS-A intercalibration materials may be used to improve the consistency of cosmogenic 21Ne to the level of the analytical precision.
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Interlaboratory Comparison of cosmogenic 21 Ne in quartz
Quaternary Geochronology, 2015Co-Authors: Pieter Vermeesch, Greg Balco, Pierrehenri Blard, Tibor Dunai, Florian Kober, Samuel Niedermann, Stefan Strasky, David Shuster, Finlay Stuart, Rainer WielerAbstract:We performed an Interlaboratory Comparison study with the aim to determine the accuracy of cosmogenic 21Ne measurements in quartz. CREU-1 is a natural quartz standard prepared from amalgamated vein clasts which were crushed, thoroughly mixed, and sieved into 125–250 μm and 250–500 μm size fractions. 50 aliquots of CREU-1 were analyzed by five laboratories employing six different noble gas mass spectrometers. The released gas contained a mixture of 16–30% atmospheric and 70–84% non-atmospheric (predominantly cosmogenic) 21Ne, defining a linear array on the 22Ne/20Ne-21Ne/20Ne three isotope diagram with a slope of 1.108 ± 0.014. The internal reproducibility of the measurements is in good agreement with the formal analytical precision for all participating labs. The external reproducibility of the 21Ne concentrations between labs, however, is significantly overdispersed with respect to the reported analytical precision. We report an average reference concentration for CREU-1 of 348 ± 10 × 106 at [21Ne]/g[SiO2], and suggest that the 7.1% (2σ) overdispersion of our measurements may be representative of the current accuracy of cosmogenic 21Ne in quartz. CREU-1 was tied to CRONUS-A, which is a second reference material prepared from a sample of Antarctic sandstone. We propose a reference value of 320 ± 11 × 106 at/g for CRONUS-A. The CREU-1 and CRONUS-A intercalibration materials may be used to improve the consistency of cosmogenic 21Ne to the level of the analytical precision.
Clark A. Hamilton - One of the best experts on this subject based on the ideXlab platform.
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Interlaboratory Comparison at 10 V DC
IEEE Transactions on Instrumentation and Measurement, 2005Co-Authors: Clark A. Hamilton, S.l. Kupferman, M.t. Salazar, D. Deaver, Barry WoodAbstract:An Interlaboratory Comparison at 10 V DC has been made among 16 national, industrial, and military standards laboratories in North America. The Comparison used a set of four traveling Zener dc reference standards. A pivot laboratory made measurements at the beginning, at the end, and at four other times during the Comparison. The measured differences and their uncertainties are reported and used to demonstrate equivalence between each participant and the pivot, and between each participant and the National Institute of Standards and Technology (NIST). All of the differences fall within two parts in 10/sup 8/.
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Interlaboratory Comparison of Josephson voltage standards
IEEE Transactions on Instrumentation and Measurement, 2001Co-Authors: D. Deaver, W.b. Miller, L. Pardo, K. Jaeger, D. Plowman, Clark A. HamiltonAbstract:An Interlaboratory Comparison of Josephson Voltage Standards (JVS) has been made among 16 national, industrial; and military standards laboratories in North America and one in Europe. The Comparison was made at 10 V using a set of four traveling Zener reference standards. A pivot laboratory made measurements at the beginning, at the end, and at nine other times during the Comparison. The measured differences and their uncertainties are reported and used to establish a table of equivalence between each participant and the pivot, and between each participant and the National Institute of Standards and Technology (NIST). All but two of the differences fall within two parts in 10/sup 8/.
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the fourth Interlaboratory Comparison of 10 v josephson voltage standards in north america
Metrologia, 1998Co-Authors: Chihming Wang, Clark A. HamiltonAbstract:An Interlaboratory Comparison of Josephson voltage standards has been made among fifteen national, industrial, and military standards laboratories in North America. The Comparison was made at 10 V using a set of four travelling Zener reference standards. The uncertainty (2σ) of the Comparison is estimated to be 17 parts in 109. The measurements of all participants fall within this uncertainty, indicating that no significant difference has been detected among them.
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North American Interlaboratory Comparison of 10 V Josephson voltage standards
Conference on Precision Electromagnetic Measurements. Conference Digest. CPEM 2000 (Cat. No.00CH37031), 1Co-Authors: D. Deaver, W.b. Miller, L. Pardo, K. Jaeger, D. Plowman, Clark A. HamiltonAbstract:An Interlaboratory Comparison of Josephson voltage standards has been made among 16 national, industrial, and military standards laboratories in North America and 1 in Germany. The Comparison was made at 10 V using a set of four transfer Zener reference standards. A pivot laboratory made measurements at the beginning, end, and at 9 other times during the Comparison. The measured differences and their uncertainties are used to establish a table of equivalence between all pairs of participants.
