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    Laboratory assessment of iron status in pregnancy.

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    Authors
    Walsh, Thomas
    O'Broin, Sean D
    Cooley, Sharon
    Donnelly, Jennifer
    Kennedy, John
    Harrison, Robert F
    McMahon, Corinna
    Geary, Michael
    Affiliation
    Rotunda Hospital, Dublin, Ireland.
    Issue Date
    2012-02-01T10:37:56Z
    MeSH
    Adolescent
    Adult
    Anemia, Iron-Deficiency/blood/diagnosis
    Clinical Laboratory Techniques/*methods
    Female
    Humans
    Iron/*blood/deficiency
    Longitudinal Studies
    Pregnancy
    Pregnancy Complications/blood/diagnosis
    Pregnancy Trimesters/blood
    Young Adult
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    Citation
    Clin Chem Lab Med. 2011 Jul;49(7):1225-30. Epub 2011 May 31.
    Journal
    Clinical chemistry and laboratory medicine : CCLM / FESCC
    URI
    http://hdl.handle.net/10147/207719
    DOI
    10.1515/CCLM.2011.187
    PubMed ID
    21627494
    Abstract
    BACKGROUND: Efforts to improve maternal nutrition during pregnancy prompted an observational study of the occurrence of maternal iron deficiency and its laboratory diagnosis in almost 500 pregnancies. METHODS: In this longitudinal study, the biochemical and haematological iron indices of women (n=492) attending a prenatal clinic in a Dublin maternity hospital were assessed at first booking (mean 15.9 weeks), and after 24 weeks, and 36 weeks of gestation. Full blood counts were measured. Serum ferritin (SF), zinc protoporphyrin (ZPP), and transferrin receptor (sTfR) concentrations were assayed and transferrin receptor index (sTfR-Index) was calculated. The occurrence of low values and their diagnostic values were considered. RESULTS: A high occurrence iron deficiency (ID) at first booking (SF<12 mug/L) had increased over six-fold by 24 weeks, and all biochemical iron indices reflected progressive iron depletion right up to term. The WHO recommended anaemia "cut-off" (Hb<110 g/L) was insensitive to biochemical iron deficiency at booking, missing over 90% of the low SF values (SF<12 mug/L) which were mostly associated with much higher Hb levels. CONCLUSIONS: This study stresses the importance of including a biochemical index of iron status in prenatal screening and supports SF as the best indicator of biochemical ID overall. sTfR was insensitive to iron deficiency in early pregnancy, whereas the sTfR-Index, as a ratio, has the potential to distinguish between ID and physiological anaemia, and may offer stability in the assessment of iron stores from early pregnancy to full term. A policy of early screening of both Hb and SF concentrations is recommended as the minimum requirement for surveillance of maternal iron status in pregnancy.
    Language
    eng
    ISSN
    1434-6621 (Print)
    1434-6621 (Linking)
    ae974a485f413a2113503eed53cd6c53
    10.1515/CCLM.2011.187
    Scopus Count
    Collections
    Rotunda Hospital

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