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American Journal of Clinical Nutrition, Vol 62, 611-620, Copyright © 1995 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Iron stores and iron absorption: effects of repeated blood donations

PJ Garry, KM Koehler and TL Simon
Department of Pathology, University of New Mexico School of Medicine, Albuquerque 87131, USA.

We assessed changes in iron stores and iron absorption after repeat blood donations using a combination of biochemical measures of iron status: ferritin, hemoglobin, and transferrin saturation. Thirty-six volunteers with a mean (+/- SD) age of 67.7 +/- 3.7 y donated an average of 15 units of blood over 3.5 y. Initial iron stores were 12.45 +/- 3.09 mg/kg for men and 12.53 +/- 3.24 mg/kg for women. Of the 20 men and 16 women who completed the study, 6 men and 10 women were taking a self-selected supplement providing approximately 20 mg Fe/d. Dietary iron intake was determined to be approximately 20 mg/d for men and approximately 18 mg/d for women. Decreases in iron stores in supplemented men were not significantly different from those in nonsupplemented men: 9.52 +/- 2.57 and 11.31 +/- 2.74 mg/kg, respectively. Nonsupplemented women showed a significantly (P < 0.05) greater decline in iron stores than did supplemented women: 13.09 +/- 2.46 and 10.60 +/- 4.15 mg/kg, respectively. Mean maximal iron absorption was approximately 4.10 mg/d for men and approximately 3.55 mg/d for women regardless of iron intake.


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