A cross-sectional study of data from the National Health and Nutritional Examination Survey from 2017 to 2020 of 8,021 adults found that 14% of U.S. adults experience absolute iron deficiency (defined as serum ferritin less than 30 ng/mL regardless of transferrin saturation), while 15% have functional iron deficiency (defined as serum ferritin greater than or equal to 30 ng/mL with transferrin saturation less than 20%). Absolute iron deficiency is more prevalent among younger women, however, …
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