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Iron deficiency in children: the relationship between pretreatment laboratory tests and subsequent hemoglobin
Insights
Detecting iron deficiency in children is crucial. While lab tests show population iron status, they poorly predict individual response to iron therapy, impacting anemia treatment effectiveness.
Area of Science:
- Pediatrics
- Hematology
- Nutritional Science
Background:
- Iron deficiency is a common cause of anemia in children.
- Accurate detection is vital for effective treatment and preventing long-term health issues.
- Assessing iron status relies on various laboratory markers.
Purpose of the Study:
- To evaluate the efficacy of iron nutrition measures in predicting treatment response in children.
- To determine if laboratory tests can identify children who will benefit from iron therapy.
Main Methods:
- A controlled treatment trial was conducted among Eskimo children.
- Hemoglobin (Hb) concentration changes were measured after iron therapy.
- Serum ferritin, transferrin saturation, and free erythrocyte protoporphyrin levels were assessed.
Main Results:
- 43% of children showed a significant Hb rise, with 26% having an intermediate response.
- Pre-treatment Hb values skewed low, normalizing post-treatment, indicating iron deficiency as the primary anemia cause.
- While markers improved, their sensitivity and specificity in predicting individual response were limited (42-63% sensitivity, 45-61% specificity).
Conclusions:
- Laboratory measures effectively reflect population iron status but are poor predictors of individual response to iron therapy.
- Identifying children who will respond to iron treatment remains a challenge despite available diagnostic tools.
Abstract:
The goal of detecting iron deficiency in children is to identify those whose Hb concentration will rise in response to treatment with iron. In a controlled treatment trial conducted among Eskimo children, we examined the effectiveness of various measures of iron nutrition in predicting a response to iron therapy (greater than 1.0 g/dl rise in Hb). A response was seen in 43%, and an additional 26% had an intermediate response (0.5 to 1.0 g/dl rise). When individual Hb values were expressed as SD scores of the Hb distribution of a reference population, a marked skew toward low scores was seen before treatment. After treatment, the distribution became more Gaussian, indicating that iron deficiency had been the major cause of anemia. Serum ferritin, transferrin saturation, and free erythrocyte protoporphyrin levels moved toward normal with treatment, however, none of the tests used was very effective in distinguishing individuals who would have a response t Hb from those who would not (sensitivities: 63 to 42%, specificities: 45 to 61%). Laboratory measures of iron nutrition were far more helpful in depicting the iron status of the population than they were in distinguishing iron-responsive from nonresponsive individuals.