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Development of iron status and response to iron medication in pubertal boys
1Children's Hospital, University of Helsinki, Finland.
Insights
Iron deficiency is a risk for growing boys during puberty. Assessment requires considering age and development, not just lab results, to ensure adequate iron status.
Area of Science:
- Pediatric endocrinology
- Nutritional science
- Hematology
Background:
- Male puberty involves rapid growth, increasing iron demands.
- Assessing iron deficiency in adolescents is challenging, with reported prevalences varying widely.
- Existing criteria may not fully capture the nuances of iron status during pubertal development.
Purpose of the Study:
- To investigate iron status changes in boys during puberty.
- To correlate iron parameters with pubertal stage, age, and growth.
- To evaluate the effectiveness of iron supplementation in pubertal boys.
Main Methods:
- Longitudinal study of 60 prepubertal/early pubertal boys over 24 months.
- Bi-annual testing of hemoglobin, ferritin, and transferrin levels.
- Correlation of iron parameters with Tanner genital stages (G1-G5) and age.
Main Results:
- Hemoglobin increased significantly starting at genital stage G4.
- Ferritin levels decreased in early puberty (G1-G3), suggesting a physiological adaptation.
- Iron deficiency prevalence increased with age and pubertal progression.
- Iron supplementation improved iron status parameters, confirming limitations due to deficiency.
Conclusions:
- Iron deficiency evaluation in pubertal boys needs a holistic approach.
- Consider age, pubertal development, and growth alongside laboratory markers.
- Early ferritin decline may be adaptive, not necessarily indicative of deficiency.
Abstract:
During male puberty, rapid growth of body mass and the rise in hemoglobin concentration require much iron. The increasing need for iron may carry a risk of iron deficiency. Criteria for iron deficiency in adolescence are difficult to assess, as indicated by prevalences ranging from 0.5 to 30% in five recent studies from developed countries. We followed 60 prepubertal or early pubertal boys, testing them at 6-month intervals for 24 months and relating hemoglobin levels and other iron parameters to age, pubertal development, and response to iron medication. A significant increase in mean hemoglobin was first seen at genital stage G4. In early puberty, in contrast, between stages G1 and G3, ferritin decreased. Mean transferrin increased slightly during the study. The prevalence of iron deficiency increased both with age and with advancing puberty. However, the early decline in ferritin may be a physiologic response to guarantee increasing intestinal absorption. After iron medication, we observed improvements in the levels of our parameters of iron status, which showed that hemoglobin levels had been limited by iron deficiency. In pubertal boys, evaluation of iron deficiency should not be based on laboratory parameters alone; age, pubertal development, and growth should also be taken into account.
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