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Serum ferritin in assessment of iron nutrition in healthy infants
Insights
Serum ferritin levels in infants correlate with iron intake and storage. However, relying solely on serum ferritin for diagnosing iron deficiency in infants is limited, necessitating multiple indicators.
Area of Science:
- Pediatric Nutrition
- Hematology
- Biochemistry
Background:
- Iron deficiency is a common nutritional deficiency in infants.
- Accurate assessment of iron status is crucial for infant development.
- Serum ferritin is a key indicator of iron storage but its interpretation in infants requires careful consideration.
Purpose of the Study:
- To evaluate the developmental changes in serum ferritin levels in infants.
- To assess the correlation between serum ferritin and iron nutrition indicators.
- To determine the utility of serum ferritin as a sole criterion for diagnosing iron deficiency in infants.
Main Methods:
- Longitudinal follow-up of 238 infants over their first year of life.
- Systematic iron supplementation or non-supplementation of infant diets.
- Measurement of serum ferritin, hemoglobin, mean corpuscular volume, and transferrin saturation.
Main Results:
- Serum ferritin levels showed developmental changes consistent with iron storage.
- Average serum ferritin levels correlated well with iron intake and iron nutrition.
- Low serum ferritin levels were associated with reduced transferrin saturation.
Conclusions:
- Serum ferritin is a useful indicator of iron status in groups of infants.
- Using serum ferritin alone to diagnose iron deficiency in individual infants is limited.
- Multiple laboratory indicators are recommended for a refined diagnosis of iron deficiency without anemia in infants.
Abstract:
We followed up 238 infants on 7 occasions during their first year of life. The diets of the infants were systematically either supplemented or not supplemented with iron. Developmental changes in serum ferritin were determined from a group with adequate intake of iron and without evidence of iron deficiency by three laboratory criteria: hemoglobin, mean corpuscular volume and transferrin saturation. The data indicate that the average level of serum ferritin correlates well with iron nutrition within groups of infants since the developmental changes are in accordance with the known changes in storage iron, the level of serum ferritin correlates with iron intake, and low ferritin levels are associated with lower transferrin saturation. The usefulness of serum ferritin as the sole criterion of iron deficiency in individual infants is limited, suggesting the use of more than one indicator to refine the diagnosis of iron deficiency without anemia.