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ORIGINAL RESEARCH COMMUNICATION |
1 From the Department of Nutrition, University of California, Davis, CA (JMS, BL, KGD, SZ-C); Cooperative Extension, University of California, Contra Costa County, Pleasant Hill, CA (MLF), and Cooperative Extension, University of California, Tulare County, Tulare, CA (CLL)
Background: Iron deficiency (ID) is the most common nutritional deficiency in the world and remains relatively common in at-risk groups in the United States. The actual prevalence of anemia, ID, and iron deficiency anemia (IDA) in California remains unclear.
Objective: The objective was to determine the prevalence of anemia, low iron stores, ID, and IDA in children participating in the Special Supplemental Nutrition Program for Women, Infants and Children (WIC) population, and to assess the value of using hemoglobin to predict ID.
Design: This was a cross-sectional study of a convenience sample of 12–36-mo-old children from WIC clinics in 2 California counties.
Results: The prevalence of anemia was 11.1% (hemoglobin <110 g/L at 12–24 mo or <111 g/L at 24–36 mo). Study- and literature-determined abnormal values for iron measures were as follows: serum ferritin 
8.7 or <10.0 µg/L, serum transferrin receptor 
8.4 or >10.0 µg/mL, and transferrin saturation 13.2% or <10.0%, respectively. The prevalences of low iron stores (low ferritin) were 24.8% and 29.0%, of ID (2 abnormal iron measures) were 16.2% and 8.8%, and of IDA (ID with low hemoglobin) were 3.4% and 3.2% on the basis of study- and literature-determined cutoffs, respectively. Hemoglobin concentration was used to predict study- and literature-determined ID on the basis of receiver operating characteristic curves. The sensitivity of low hemoglobin in predicting study- and literature-determined ID was low (23.2% and 40.0%, respectively).
Conclusions: Anemia and ID were prevalent in this WIC sample, but IDA was uncommon. Low hemoglobin is a poor predictor of ID.
Key Words: Iron deficiency • anemia • toddlers • serum ferritin • serum transferrin receptors • transferrin saturation • WIC • Special Supplemental Nutrition Program for Women • Infants and Children
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