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dc.contributor.authorSempos, Christopher T.
dc.contributor.authorWilliams, Emma L.
dc.contributor.authorCarter, Graham D.
dc.contributor.authorJones, Julia
dc.contributor.authorCamara, Johanna E.
dc.contributor.authorBurdette, Carolyn Q.
dc.contributor.authorHahm, Grace
dc.contributor.authorNalin, Federica
dc.contributor.authorDuewer, David L.
dc.contributor.authorKuszak, Adam J.
dc.contributor.authorMerkel, Joyce
dc.contributor.authorHoofnagle, Andrew N.
dc.contributor.authorLukas, Pierre
dc.contributor.authorCavalier, Étienne
dc.contributor.authorDurazo-Arvizu, Ramón A.
dc.contributor.authorCrump, Peter M.
dc.contributor.authorPopp, Christian
dc.contributor.authorBeckert, Christian
dc.contributor.authorSchultess, Jan
dc.contributor.authorVan Slooten, Glen
dc.contributor.authorTourneur, Carole
dc.contributor.authorPease, Camille
dc.contributor.authorKaul, Ravi
dc.contributor.authorVillarreal, Alfredo
dc.contributor.authorIvison, Fiona
dc.contributor.authorFischer, Ralf
dc.contributor.authorvan den Ouweland, Jody M. W.
dc.contributor.authorHo, Chung S.
dc.contributor.authorLaw, Emmett W. K.
dc.contributor.authorSimard, Jean-Nicolas
dc.contributor.authorGonthier, Renaud
dc.contributor.authorHolmquist, Brett
dc.contributor.authorCidade Batista, Marcelo
dc.contributor.authorMeadows, Sarah
dc.contributor.authorCox, Lorna
dc.contributor.authorJansen, Eugene
dc.contributor.authorAhmed Khan, Dilshad
dc.contributor.authorRobyak, Kimberly
dc.contributor.authorCreer, Michael H.
dc.contributor.authorKilbane, Mark
dc.contributor.authorTwomey, Patrick J.
dc.contributor.authorFreeman, James
dc.contributor.authorParker, Neil
dc.contributor.authorYuan, Jinyun
dc.contributor.authorFitzgerald, Robert
dc.contributor.authorMushtaq, Sohail
dc.contributor.authorClarke, Michael W.
dc.contributor.authorBreen, Norma
dc.contributor.authorSimpson, Christine
dc.contributor.authorWise, Stephen A.
dc.date.accessioned2021-12-07T09:58:22Z
dc.date.available2021-12-07T09:58:22Z
dc.date.issued2021-11-09
dc.identifierhttps://chesterrep.openrepository.com/bitstream/handle/10034/626543/Wise%20Frozen%20vs%20Ambient%20DEQAS%20Revised%20Oct%2015.pdf?sequence=7
dc.identifierhttps://chesterrep.openrepository.com/bitstream/handle/10034/626543/Supplementary%20Material%20Wise%20Oct12.pdf?sequence=8
dc.identifier.citationSempos, C. T., Williams, E. L., Carter, G. D., Jones, J., Camara, J. E., Burdette, C. Q., Hahm, G., Nalin, F., Duewer, D. L., Kuszak, A. J., Merkel, J., Hoofnagle, A. N., Lukas, P., Cavalier, É., Durazo-Arvizu, R. A., Crump, P. M., Popp C, Beckert, C., Schultess J., ... Wise, S. A. (2022). Assessment of serum total 25-hydroxyvitamin D assays for Vitamin D External Quality Assessment Scheme (DEQAS) materials distributed at ambient and frozen conditions. Analytical and Bioanalytical Chemistry, 414, 1015–1028. https://doi.org/10.1007/s00216-021-03742-5en_US
dc.identifier.issn1618-2642
dc.identifier.doi10.1007/s00216-021-03742-5
dc.identifier.urihttp://hdl.handle.net/10034/626543
dc.descriptionThis version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s00216-021-03742-5en_US
dc.description.abstractThe Vitamin D External Quality Assessment Scheme (DEQAS) distributes human serum samples four times per year to over 1000 participants worldwide for the determination of total serum 25-hydroxyvitamin D [25(OH)D)]. These samples are stored at −40 °C prior to distribution and the participants are instructed to store the samples frozen at −20 °C or lower after receipt; however, the samples are shipped to participants at ambient conditions (i.e., no temperature control). To address the question of whether shipment at ambient conditions is sufficient for reliable performance of various 25(OH)D assays, the equivalence of DEQAS human serum samples shipped under frozen and ambient conditions was assessed. As part of a Vitamin D Standardization Program (VDSP) commutability study, two sets of the same nine DEQAS samples were shipped to participants at ambient temperature and frozen on dry ice. Twenty-eight laboratories participated in this study and provided 34 sets of results for the measurement of 25(OH)D using 20 ligand binding assays and 14 liquid chromatography–tandem mass spectrometry (LC–MS/MS) methods. Equivalence of the assay response for the frozen versus ambient DEQAS samples for each assay was evaluated using multi-level modeling, paired t-tests including a false discovery rate (FDR) approach, and ordinary least squares linear regression analysis of frozen versus ambient results. Using the paired t-test and confirmed by FDR testing, differences in the results for the ambient and frozen samples were found to be statistically significant at p < 0.05 for four assays (DiaSorin, DIAsource, Siemens, and SNIBE prototype). For all 14 LC–MS/MS assays, the differences in the results for the ambient- and frozen-shipped samples were not found to be significant at p < 0.05 indicating that these analytes were stable during shipment at ambient conditions. Even though assay results have been shown to vary considerably among different 25(OH)D assays in other studies, the results of this study also indicate that sample handling/transport conditions may influence 25(OH)D assay response for several assays.en_US
dc.publisherSpringeren_US
dc.relation.urlhttps://www.springer.com/journal/216en_US
dc.relation.urlhttps://link.springer.com/article/10.1007/s00216-021-03742-5en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.subject25-Hydroxyvitamin D3en_US
dc.subject25-Hydroxyvitamin D2en_US
dc.subjectTotal 25-hydroxyvitamin Den_US
dc.titleAssessment of serum total 25-hydroxyvitamin D assays for Vitamin D External Quality Assessment Scheme (DEQAS) materials distributed at ambient and frozen conditionsen_US
dc.typeArticleen_US
dc.identifier.eissn1618-2650en_US
dc.contributor.departmentNational Institutes of Health; Imperial Healthcare NHS Trust; National Institute of Standards and Technology; University of Washington; University of Liège; University of Southern California; University of Wisconsin-Madison; Abbott Laboratories; Awareness Technology; bioMérieux; Bio-Rad Laboratories; Central Manchester Foundation Trust; Chromsystems Instruments & Chemicals; Canisius Wilhelmina Hospital; The Chinese University of Hong Kong; Endoceutics; LabCorp Specialty Testing Group; Hospital Israelita Albert Einstein; University of Cambridge; National Institute of Public Health and the Environment; National University of Medical Sciences; Penn State University; St. Vincent’s University Hospital; Siemens-Healthineers; SNIBE; University of California at San Diego; University of Chester; The University of Western Australia; Waters Technologies Ireland; Yale Universityen_US
dc.identifier.journalAnalytical and Bioanalytical Chemistryen_US
or.grant.openaccessYesen_US
rioxxterms.funderThe Office of Dietary Supplements at the National Institutes of Health (NIH-ODS)en_US
rioxxterms.identifier.projectn/aen_US
rioxxterms.versionAMen_US
rioxxterms.versionofrecord10.1007/s00216-021-03742-5en_US
rioxxterms.licenseref.startdate2022-11-09
dcterms.dateAccepted2021-10-18
rioxxterms.publicationdate2021-11-09
dc.date.deposited2021-12-07en_US
dc.indentifier.issn1618-2642en_US


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