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Cord blood transferrin receptors to assess fetal iron status
D G Sweet1, G A Savage, R Tubman
1Royal Maternity Hospital, Grosvenor Road, Belfast BT12 6BB, Northern Ireland. dsweet@dnet.co.uk
Insights
Cord blood serum transferrin receptors (STfRs) do not change with gestational age. STfR levels reflect fetal iron needs for red blood cell production, not direct gestational influence.
Area of Science:
- Neonatal Medicine
- Hematology
- Biochemistry
Background:
- Iron deficiency is a concern in preterm infants.
- Serum transferrin receptors (STfRs) are a marker of iron status.
- Understanding iron status across gestational ages is crucial for neonatal care.
Purpose of the Study:
- To investigate the relationship between gestational age and iron status markers in cord blood.
- To evaluate the utility of serum transferrin receptors (STfRs) in assessing fetal iron status.
Main Methods:
- Cord blood samples from 144 infants were analyzed.
- Measurements included STfRs, iron, ferritin, total iron binding capacity, hemoglobin, and reticulocytes.
- Infants were categorized into very preterm, preterm, and term groups based on gestation.
Main Results:
- Serum iron, ferritin, and total iron binding capacity were highest in term infants.
- Reticulocyte counts were highest in very preterm infants.
- STfR levels showed no significant correlation with gestational age but correlated with hemoglobin and reticulocytes.
Conclusions:
- Gestational age does not directly influence cord blood STfR levels.
- STfRs in cord blood likely indicate the fetus's iron requirements for erythropoiesis.
- STfRs may serve as an indicator of fetal iron utilization for red blood cell formation.
Objective:
To study iron status at different gestational ages using cord blood serum transferrin receptors (STfRs).
Methods:
STfRs, iron, ferritin, total iron binding capacity, haemoglobin, and reticulocytes were measured in 144 cord blood samples. The babies were divided into three groups according to gestation (26 very preterm (24-29 weeks); 50 preterm (30-36 weeks); 68 term (37-41 weeks)).
Results:
Serum iron, ferritin, and total iron binding capacity were highest at term, whereas reticulocytes were highest in the very preterm. STfR levels were not influenced by gestation. Haemoglobin (r = 0.46; p < 0.0001) and reticulocytes (r = 0.42; p < 0.0001) were the only indices that independently correlated with STfR levels.
Conclusions:
STfR levels in cord blood are not directly influenced by gestation and probably reflect the iron requirements of the fetus for erythropoiesis.