Erythrocytic zinc content during childhood

Area of Science:

• Pediatric Nutrition
• Trace Element Metabolism
• Hematology

Background:

• Zinc is an essential trace element crucial for numerous physiological processes.
• Understanding zinc's developmental trajectory in children is vital for assessing nutritional status and health.
• Erythrocytic zinc serves as a stable indicator of long-term zinc status.

Purpose of the Study:

• To investigate the developmental changes in erythrocytic zinc content throughout childhood.
• To establish reference ranges for erythrocytic zinc in various pediatric age groups.
• To compare pediatric erythrocytic zinc levels with those of adults.

Main Methods:

• Cross-sectional study involving 166 healthy children across different age groups (newborns to 12 years).
• Inclusion of 20 healthy adults as a reference group.
• Quantification of erythrocytic zinc content (pg/10^6 RBC) using established laboratory methods.

Main Results:

• Erythrocytic zinc levels showed a significant increase from infancy through childhood.
• Mean values ranged from 507 +/- 197 pg/10^6 RBC in newborns to 1,256 +/- 186 pg/10^6 RBC in children aged 6-12 years.
• While levels increased steadily, they remained lower than adult values (1,482 +/- 390 pg/10^6 RBC) until approximately age four.

Conclusions:

• Childhood is characterized by a dynamic increase in erythrocytic zinc levels.
• Erythrocytic zinc content in children approaches adult levels by the fourth year of life.
• These findings provide valuable insights into zinc accretion during development and inform pediatric nutritional guidelines.