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Elevated serum transferrin saturation and mortality.

Arch G Mainous1, James M Gill, Peter J Carek

  • 1Department of Family Medicine, Medical University of South Carolina, Charleston, SC 29425, USA. mainouag@musc.edu

Annals of Family Medicine
|April 16, 2004
PubMed
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Elevated transferrin saturation, a marker for iron overload, is linked to increased mortality risk in US adults. This finding highlights the importance of monitoring transferrin saturation for public health.

Area of Science:

  • Public Health
  • Epidemiology
  • Biochemistry

Background:

  • A significant portion of US adults exhibit elevated transferrin saturation, indicating a potential for iron overload.
  • Iron overload is a condition that can lead to various health complications.

Purpose of the Study:

  • To investigate the association between elevated serum transferrin saturation and all-cause mortality.
  • To determine if higher transferrin saturation levels correlate with increased mortality risk.

Main Methods:

  • Utilized data from the First Health and Nutrition Examination Survey (NHANES I) and its follow-up study.
  • Employed Cox proportional hazards regression analysis on a cohort of 10,714 US adults aged 25-74.
  • Examined mortality in relation to transferrin saturation cutoffs of >45%, >50%, >55%, and >60%.

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Main Results:

  • A serum transferrin saturation exceeding 55% was significantly associated with a 1.60-fold increased risk of all-cause mortality (HR=1.60, 95% CI: 1.17-2.21).
  • No deaths were attributed to hemochromatosis, but individuals with saturation >55% showed higher mortality from cirrhosis and diabetes.
  • These causes of death are consistent with potential iron overload complications.

Conclusions:

  • Elevated serum transferrin saturation, present in over 2% of the US adult population, is an independent risk factor for all-cause mortality.
  • These findings underscore the public health significance of elevated transferrin saturation.