Results of an international round robin for the quantification of serum non-transferrin-bound iron: Need for defining standardization and a clinically relevant isoform
Abstract
Non-transferrin-bound iron (NTBI) appears in the circulation of patients with iron overload. Various methods to measure NTBI were comparatively assessed as part of an international interlaboratory study. Six laboratories participated in the study, using methods based on iron mobilization and detection with iron chelators or on reactivity with bleomycin. Serum samples of 12 patients with hereditary (n=11) and secondary (n=1) hemochromatosis were measured during a 3-day analysis using 4 determinations per sample per day, making a total of 144 measurements per laboratory. Bland-Altman plots for repeated measurements are presented. The methods differed widely in mean serum NTBI level (range 0.12-4.32mumol/L), between-sample variation (SD range 0.20-2.13mumol/L and CV range 49.3-391.3%), and within-sample variation (SD range 0.02-0.45mumol/L and CV range 4.4-193.2%). The results obtained with methods based on chelators correlated significantly (R(2) range 0.86-0.99). On the other hand, NTBI values obtained by the various methods related differently from those of serum transferrin saturation (TS) when expressed in terms of both regression coefficients and NTBI levels at TS of 50%. Recent studies underscore the clinical relevance of NTBI in the management of iron-overloaded patients. However, before measurement of NTBI can be introduced into clinical practice, there is a need for more reproducible protocols as well as information on which method best represents the pathophysiological phenomenon and is most pertinent for diagnostic and therapeutic purposes.
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Later reports of HH pedigrees observed the C282Y mutation in both alleles of the HFE gene with a prevalence of between 60% and 100%.
“Later reports of HH pedigrees also observed this mutation in both alleles of the HFE gene that encodes a tyrosine instead of the normal cysteine at codon 282 (C282Y), as having a prevalence of between 60% and 100% (40, 147, 150).”
From Intracellular iron transport and storage: from molecular mechanisms to health implications (2008) · cites this paper as [147]
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- Authors
- Jacobs, E. M. G., Hendriks, J. C. M., van Tits, B. L. J. H., Evans, P. J., Breuer, W., Liu, D. Y., Jansen, E. H. J. M., Jauhiainen, K., Sturm, B., Porter, J. B., Scheiber-Mojdehkar, B., von Bonsdorff, L., Cabantchik, Z. I., Hider, R. C., & Swinkels, D. W.
- Affiliations
- Radboud University Nijmegen (NL)
- University College London (GB)
- Hebrew University of Jerusalem (IL)
- King's College London (GB)
- Finnish Red Cross (FI)
- University of Vienna (AT)
- Corresponding author
- Swinkels, Dorine W.
- Venue
- Analytical Biochemistry
- Publisher
- Elsevier BV
- Published
- 2005-06
- Volume
- 341
- Issue
- 2
- Pages
- 241-250
- ISSN
- 0003-2697 (ISSN-L)
- OpenAlex
- W2117280779
- Cited by
- 101
- References
- 25
- Citations by year
- 2025: 2 · 2024: 3 · 2023: 1 · 2022: 5 · 2021: 2 · 2020: 2 · 2019: 5 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 4 · 2014: 7 · 2013: 8 · 2012: 5
- FWCI
- 4.53
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Analytical Biochemistry (publishedVersion)
- PubMed (publishedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Research Portal (King's College London) (submittedVersion)
- Radboud Repository (Radboud University) (submittedVersion)
- Rivm (National Institute for Public Health and the Environment) (submittedVersion)
- Funders
- Radboud Universitair Medisch Centrum
- Topics
- Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
- Health Sciences › Medicine › Physiology › Clinical Laboratory Practices and Quality Control
- Health Sciences › Medicine › Genetics › Hemoglobinopathies and Related Disorders
- Keywords
- non-transferrin-bound iron, iron overload, hemochromatosis, hereditary hemochromatosis, secondary hemochromatosis, interlaboratory comparison, method standardization, iron chelators, iron mobilization, transferrin saturation, measurement reproducibility
- MeSH terms
- Bleomycin, Blood Chemical Analysis, Chelating Agents, Hemochromatosis, Humans, Iron, Transferrin, Protein Isoforms
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