Comparability of Plasma Iohexol Clearance Across Population-Based Cohorts

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dc.contributorHáskóli Íslandsen_US
dc.contributorUniversity of Icelanden_US
dc.contributor.authorEriksen, Bjørn O.
dc.contributor.authorSchaeffner, Elke
dc.contributor.authorMelsom, Toralf
dc.contributor.authorEbert, Natalie
dc.contributor.authorvan der Giet, Markus
dc.contributor.authorGudnason, Vilmundur
dc.contributor.authorIndridason, Olafur Skuli
dc.contributor.authorKarger, Amy
dc.contributor.authorLevey, Andrew S.
dc.contributor.authorSchuchardt, Mirjam
dc.contributor.authorSørensen, Liv Karin
dc.contributor.authorPalsson, Runolfur
dc.contributor.schoolHeilbrigðisvísindasvið (HÍ)en_US
dc.contributor.schoolSchool of Health Sciences (UI)en_US
dc.date.accessioned2020-06-02T14:49:51Z
dc.date.available2020-06-02T14:49:51Z
dc.date.issued2019-12-23
dc.descriptionPublisher's version (útgefin grein)en_US
dc.description.abstractRationale & Objective: Glomerular filtration rate (GFR) estimation based on creatinine or cystatin C level is currently the standard method for assessing GFR in epidemiologic research and clinical trials despite several important and well-known limitations. Plasma iohexol clearance has been proposed as an inexpensive method for measuring GFR that could replace estimated GFR in many research projects. However, lack of standardization for iohexol assays and the use of different protocols such as single- and multiple-sample methods could potentially hamper comparisons across studies. We compared iohexol assays and GFR measurement protocols in 3 population-based European cohorts. Study Design: Cross-sectional investigation. Setting & Participants: Participants in the Age, Gene/Environment Susceptibility-Kidney Study (AGES-Kidney; n = 805), the Berlin Initiative Study (BIS, n = 570), and the Renal Iohexol Clearance Survey Follow-up Study (RENIS-FU; n = 1,324). Tests Compared: High-performance liquid chromatography analyses of iohexol. Plasma iohexol clearance calculated using single- versus multiple-sample protocols. Outcomes: Measures of agreement between methods. Results: Frozen samples from the 3 studies were obtained and iohexol concentrations were remeasured in the laboratory at the University Hospital of North Norway. Lin's concordance correlation coefficient ρ was >0.96 and Cb (accuracy) was >0.99 for remeasured versus original serum iohexol concentrations in all 3 cohorts, and Passing-Bablok regression did not find differences between measurements, except for a slope of 1.025 (95% CI, 1.006-1.046) for the log-transformed AGES-Kidney measurements. The multiple-sample iohexol clearance measurements in AGES-Kidney and BIS were compared with single-sample GFRs derived from the same iohexol measurements. Mean bias for multiple-sample relative to single-sample GFRs in AGES-Kidney and BIS were −0.25 and −0.15 mL/min, and 99% and 97% of absolute differences were within 10% of the multiple-sample result, respectively. Limitations: Lack of comparison with an independent gold-standard method. Conclusions: Agreement between the iohexol assays and clearance protocols in the 3 investigated cohorts was substantial. Our findings indicate that plasma iohexol clearance measurements can be compared across these studies.en_US
dc.description.sponsorshipAGES-Kidney was supported by a grant from National Institutes of Health, United States (R01 DK082447), a contract from the National Institute on Aging, United States (N01-AG-1-2100), Hjartavernd, Iceland (Icelandic Heart Association), and the Icelandic Parliament (Althingi). The Icelandic Heart Association provided support for data collection. BIS measurements were funded by the KfH-Foundation of Preventive Medicine, Germany and the Dr. Werner Jackstädt Foundation, Germany. RENIS-FU was funded by the Northern Norway Regional Health Authority and supported by a grant from Boehringer-Ingelheim, Germany. The funding sources did not have any role in study design, analysis, and interpretation of data; writing the report; and the decision to submit the report for publication.en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationEriksen, B. O., et al. (2019). "Comparability of Plasma Iohexol Clearance Across Population-Based Cohorts." American Journal of Kidney Diseases.en_US
dc.identifier.doi10.1053/j.ajkd.2019.10.008
dc.identifier.issn0272-6386
dc.identifier.journalAmerican Journal of Kidney Diseasesen_US
dc.identifier.urihttps://hdl.handle.net/20.500.11815/1868
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.relation.ispartofseriesAmerican Journal of Kidney Diseases;2019
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S0272638619311229?via%3Dihuben_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectNephrologyen_US
dc.subjectAccuracyen_US
dc.subjectAgreementen_US
dc.subjectConcordance correlationen_US
dc.subjectGlomerular filtration rate (GFR)en_US
dc.subjectIohexolen_US
dc.subjectKidney function testsen_US
dc.subjectMeasured GFRen_US
dc.subjectMeasurement erroren_US
dc.subjectNýrnasjúkdómaren_US
dc.subjectsjúkdómen_US
dc.titleComparability of Plasma Iohexol Clearance Across Population-Based Cohortsen_US
dc.typeinfo:eu-repo/semantics/articleen_US
dcterms.licenseThis is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).en_US

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