Study of maternal influences on fetal iron status at term using cord blood transferrin receptors
D G Sweeta, G Savageb, T R J Tubmana, T R J Lappinb, H L Hallidaya
a Department of Child
Health, The Queen's University of Belfast and Regional Neonatal Unit,
Royal Maternity Hospital, Belfast, UK, b Department of
Haematology, The Queen's University of Belfast
Correspondence to: Dr D G Sweet, Perinatal Room, Royal Maternity Hospital, Grosvenor Road, Belfast BT12 6BB, Northern Ireland, UK dsweet{at}dnet.co.uk
Accepted 29 July 2000
AIMS
To determine effects of
maternal iron depletion and smoking on iron status of term babies using
serum transferrin receptors (STfR) and their ratio to ferritin (TfR-F
index) in cord blood.
METHODS
Iron, ferritin, STfR, and
haemoglobin (Hb) concentration were measured and TfR-F index calculated
in 67 cord /maternal blood pairs. Twenty six mothers were iron depleted
(ferritin <10 µg/l) and 28 were smokers.
RESULTS
Maternal iron depletion was
associated with decreased cord ferritin (113 v 171 µg/l) and Hb (156 v 168 g/l) but no change in STfR or TfR-F
index. Smoking was associated with increased cord Hb (168 v 157 g/l) and TfR-F index (4.1 v 3.4), and decreased ferritin (123 v 190 µg/l). Cord TfR-F index and Hb were
positively correlated (r = 0.48).
CONCLUSIONS
Maternal iron depletion
is associated with reduced fetal iron stores but no change in free iron
availability. Smoking is associated with increased fetal iron
requirements for erythropoiesis.
Keywords: iron status; pregnancy; smoking; transferrin receptors
© 2001 by Archives of Disease in Childhood
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