Reliability of serum assays of iron status in postmenopausal women

Ann Epidemiol. 2007 May;17(5):354-8. doi: 10.1016/j.annepidem.2006.07.004. Epub 2006 Oct 5.

Abstract

Purpose: The aim of the study is to determine the reliability during a 2-year period of several newly developed iron-related assays to assess their potential for use in prospective epidemiologic studies.

Methods: We assessed the temporal reliability of several iron-related assays by using three serum samples collected at yearly intervals from 50 postmenopausal participants in a large prospective study.

Results: We observed high reliability coefficients for ferritin (0.78; 95% confidence interval [CI], 0.67-0.86), soluble transferrin receptor (sTfR; 0.79; 95% CI, 0.69-0.87), sTfR/ferritin ratio (0.74; 95% CI, 0.62-0.83), and hepcidin (0.89; 95% CI, 0.84-0.94). In a subset of 30 women, lower reliability was observed for serum iron (0.50; 95% CI, 0.29-0.70), unsaturated iron-binding capacity (0.55; 95% CI, 0.34-0.73), total iron-binding capacity (0.60; 95% CI, 0.40-0.76), and serum transferrin saturation rate (0.44; 95% CI, 0.22-0.65). The reliability of anti-5-hydroxymethyl-2'-deoxyuridine autoantibody titers, a biomarker of oxidized DNA damage, one of the mechanisms by which iron is thought to impact disease risk, was very high (0.97, 95% CI, 0.5-0.99).

Conclusions: Our results show that some newly developed iron-related assays could be useful tools to assess iron-disease associations in prospective cohorts that collect a single blood sample.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adult
  • Analysis of Variance
  • Autoantibodies / blood
  • Biomarkers / blood*
  • Blood Chemical Analysis / methods
  • Blood Chemical Analysis / standards*
  • Deoxyuracil Nucleotides / blood
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Ferritins / analysis
  • Ferritins / blood*
  • Humans
  • Iron / blood*
  • Middle Aged
  • New York City
  • Postmenopause / blood*
  • Prospective Studies
  • Reproducibility of Results
  • Surveys and Questionnaires
  • Transferrin / analysis

Substances

  • Autoantibodies
  • Biomarkers
  • Deoxyuracil Nucleotides
  • Transferrin
  • hydroxymethyldeoxyuridine triphosphate
  • Ferritins
  • Iron