Iron deficiency in an Eskimo village. The value of serum ferritin in assessing iron nutrition before and after a three-month period of iron supplementation.

The serum ferritin concentration, a new means of assessing iron nutrition, was utilized in conjunction with the hematocrit value, serum iron concentration, and total iron binding capacity to determine the effect of a three-month period of iron supplementation in a group of 146 Eskimo children in Chevak, Alaska. Before treatment, 41% of the children had concentrations of serum ferritin below normal, 18% had a subnormal serum transferrin saturation, and 26% were anemic. After supplementation, only 6% had a subnormal serum ferritin concentration. Despite this evidence of improved iron stores in the group as a whole, the prevalence of low serum transferrin saturation and of anemia remained high, 15% and 17%, respectively. These results could be explained by a high incidence of infection, which, like iron deficiency, is associated with anemia and a low serum transferrin saturation. We conclude that the serum ferritin determination reflected an improvement in iron nutrition that was not as readily apparent by other measurements, and that factors other than iron deficiency also played an important role in the mild anemia that was prevalent in Chevak.