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Developmental changes in serum ferritin and erythrocyte protoporphyrin in normal (nonanemic) children
Insights
This study shows that serum ferritin and erythrocyte protoporphyrin levels change with age in children. These changes suggest improved iron status and availability for heme synthesis as children grow.
Area of Science:
- Pediatric Hematology
- Biochemistry
- Human Development
Background:
- Iron is crucial for red blood cell formation and overall child development.
- Understanding normal iron status markers like serum ferritin and erythrocyte protoporphyrin is essential for identifying deficiencies.
- Developmental changes in iron metabolism during childhood require characterization.
Purpose of the Study:
- To characterize the developmental variations in serum ferritin and erythrocyte protoporphyrin levels in children.
- To establish age-related reference ranges for these iron status indicators.
- To investigate the relationship between these markers and hematocrit during childhood.
Main Methods:
- Analysis of serum ferritin and erythrocyte protoporphyrin levels in 4039 children aged 6 months to 12 years.
- Derivation of age-related descriptive statistics, including standard deviations.
- Correlation analysis between iron markers, hematocrit, and age.
Main Results:
- Serum ferritin levels showed a progressive increase with age, with -2 SD values rising from 12 to 21 µg/L.
- Erythrocyte protoporphyrin levels decreased with age, with +2 SD values falling from 65 to 42 µg/dL whole blood.
- Mean serum ferritin increased throughout the first 12 years, while erythrocyte protoporphyrin peaked at 1-2 years and stabilized after 4-6 years.
Conclusions:
- Age-related changes in serum ferritin and erythrocyte protoporphyrin reflect evolving iron storage and availability.
- The observed trends suggest improved iron status and availability for heme synthesis with increasing age in children.
- These findings provide valuable reference data for pediatric iron status assessment.
Abstract:
We studied 4039 children who were 6 months to 12 yr of age to characterize developmental variations of serum ferritin and erythrocyte protoporphyrin. Age-related descriptive statistics were derived. The -2 SD value for serum ferritin was found to increase progressively from 12 to 21 micrograms/1 with increasing age, while the +2 SD value for erythrocyte protoporphyrin was found to decrease progressively from 65 to 42 micrograms/dl whole blood with increasing age. While the mean serum ferritin value was found to continue to rise throughout the first 12 yr of life, erythrocyte protoporphyrin values were highest at 1 to 2 yr of age, then fell to essentially constant levels after 4 to 6 yr of age. These relationships, as well as the linear relationship of increasing hematocrit and serum ferritin with increasing age, suggest that the rise of hematocrit with age, as previously observed, is associated with improving storage and availability of iron for heme synthesis.