The assessment of newborn iron stores at birth: a review of the literature and standards for ferritin concentrations.

Abstract:

BACKGROUND:Serum ferritin measurements are used in clinical populations to estimate total body iron stores and the risk of subsequent iron deficiency or overload. The lack of normative newborn serum ferritin concentration data between 23 and 41 weeks has led to difficulty in establishing the incidence and degree of abnormal iron status in the neonatal period. OBJECTIVES:The primary objective of this review was to summarize the maternal and gestational factors that determine ferritin concentrations in full-term and pre-term newborn infants and to generate comprehensive reference values. The secondary objective was to assess serum ferritin concentrations in newborn infants at risk for abnormal fetal iron metabolism, including maternal diabetes mellitus, intrauterine growth restriction and maternal smoking during pregnancy. METHODS:Serum ferritin and gestational age data at birth from 457 low-risk pre-term and term infants of 23-41 weeks gestation obtained from 35 published studies reviewed from a period of 25 years and from recently collected data from our centers were assessed by regression analysis. Slopes and intercepts of the high-risk groups were compared with the standard curve. RESULTS:Umbilical cord serum ferritin concentrations increased with advancing gestational age, from a mean of 63 mug/l at 23 weeks to 171 mug/l at 41 weeks gestation (p < 0.001). The infants of diabetic mothers had a lower intercept than the control infants (p < 0.001). CONCLUSIONS:Iron deficiency and overload have been implicated in neurodevelopmental impairments. Normative cord serum ferritin data may permit a more precise assessment of infants who are at risk for abnormal iron status at birth.

journal_name

Neonatology

journal_title

Neonatology

authors

Siddappa AM,Rao R,Long JD,Widness JA,Georgieff MK

doi

10.1159/000100805

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

73-82

issue

2

eissn

1661-7800

issn

1661-7819

pii

000100805

journal_volume

92

pub_type

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