Total iron
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Total Iron: Bioavailability, Deficiency, and Measurement Techniques
Total Iron Bioavailability in the US Diet
Recent studies have indicated that the bioavailability of total iron (heme and nonheme) from the US diet is lower than previously estimated. The geometric mean of nonheme iron absorption for all subjects was found to be 3.7%, with higher absorption rates in females (5.6%) compared to males (2.6%) . Additionally, nonheme iron absorption varied among different ethnic groups, being lower in non-Hispanic whites (3.5%) compared to Mexican Americans (4.5%) and non-Hispanic blacks (4.4%) . The estimated total iron absorption was around 15.5%, suggesting a need to revisit the current estimates of iron bioavailability from the US diet .
Iron Deficiency and Its Global Impact
Iron deficiency anemia affects over 1.2 billion individuals worldwide, with iron deficiency without anemia being even more prevalent . Total-body iron deficiency can result from increased physiological needs, reduced intake, defective absorption, or chronic blood loss . The body's adaptation to iron deficiency involves regulatory proteins that increase iron uptake and retention, while systemic regulation is managed by the hormone hepcidin, which controls iron release into the plasma . Effective management of iron deficiency includes both oral and intravenous iron therapies, with the latter becoming more popular due to its rapid and sustained hematological response .
Iron Supplementation and Total Body Iron
In individuals experiencing repeated phlebotomy, such as frequent blood donors, lower doses of oral iron (19 mg and 38 mg) have been found to be as effective as higher doses (65 mg) in mitigating iron deficiency . This suggests that much lower doses of iron than currently used can be effective for clinical treatment, potentially reducing gastrointestinal side effects and improving patient compliance .
Measurement Techniques for Total Iron
Accurate quantification of total iron is crucial for assessing iron burden in patients with iron overload diseases. A new unified-ferene (u-ferene) assay has been developed, enabling simultaneous quantification of both labile and total iron from the same biological specimen preparation . This method offers the same sensitivity as the current gold standard, inductively coupled plasma mass spectrometry (ICP-MS), and provides a more accessible and economical option for the scientific community .
Hepatic Iron Concentration as an Indicator of Total Body Iron Stores
In patients with thalassemia major, hepatic iron concentration has been shown to be a reliable indicator of total body iron stores. A significant correlation was found between the decrease in hepatic iron concentration and total body iron stores during phlebotomy treatment . This method allows for accurate estimation of total body iron stores, providing a quantitative means of measuring long-term iron balance in patients with transfusion-related iron overload .
Iron Requirements in Menstruating Women
Menstruating women, both adults and teenagers, have specific iron requirements due to menstrual blood losses. The total absorbed iron requirements have been calculated to be 2.84 mg/day for adult women and 3.21 mg/day for teenagers . Dietary iron bioavailability in these groups is estimated to be around 16.6% for the US diet, translating to dietary iron requirements of 18.9 mg/day for adult women and 21.4 mg/day for teenagers .
Conclusion
Understanding the bioavailability, deficiency, and accurate measurement of total iron is crucial for addressing iron-related health issues. Recent studies highlight the need to revisit current estimates of iron bioavailability in the US diet, the global impact of iron deficiency, and the effectiveness of lower-dose iron supplementation. Advances in measurement techniques, such as the u-ferene assay, provide more accessible and precise methods for quantifying total iron, aiding in better management and treatment of iron-related conditions.
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