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Clinical Chemistry 36: 487-491, 1990;
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Clinical Chemistry, Vol 36, 487-491, Copyright © 1990 by American Association for Clinical Chemistry

Response of various indices of iron status to acute iron depletion produced in menstruating women by low iron intake and phlebotomy

DB Milne, SK Gallagher and FH Nielsen
United States Department of Agriculture, Grand Forks Human Nutrition Research Center, ND 58202.

We investigated response sensitivities of indices of iron status to controlled iron depletion and repletion in 11 premenopausal women. The women were depleted of storage iron (as reflected by serum ferritin) through a combination of a low-iron diet and phlebotomy. They then consumed a diet containing 13.7 mg of iron per 2000 kcal, supplemented with either ascorbic acid or placebo (for 5 1/2 weeks) and a daily 50- mg iron supplement (for the subsequent 17 days). The relative sensitivities of different indices for detecting iron depletion were as follows: ferritin greater than % transferrin saturation greater than plasma iron greater than hemoglobin greater than hematocrit greater than zinc protoporphyrin (ZnPP) and erythrocyte protoporphyrin (EP). Ascorbic acid treatment during repletion, before iron supplementation, significantly (P less than 0.05) affected changes in hemoglobin, ZnPP, ZnPP/heme, and EP/heme. Changes in heme synthesis evidently do not occur until iron stores are depleted and, conversely, during iron repletion hematopoiesis must be satisfied before iron stores, as reflected by ferritin, increase. Thus, the use of only one index of iron status is of limited value for detecting iron depletion.




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Copyright © 1990 by the American Association for Clinical Chemistry.