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Maternal hemoglobin concentration and birth weight.

P J Steer1

  • 1Department of Maternal and Fetal Medicine, Imperial College School of Medicine, London, United Kingdom. p.steer@ic.ac.uk

The American Journal of Clinical Nutrition
|May 9, 2000
PubMed
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Maternal iron status during pregnancy is complex. Hemoglobin levels alone are insufficient; mean corpuscular volume is crucial for accurately diagnosing iron deficiency and optimizing pregnancy outcomes.

Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Hematology

Background:

  • Pregnancy necessitates increased maternal iron absorption.
  • Hemoglobin concentration alone is an unreliable indicator of iron status due to physiological plasma volume expansion during pregnancy.
  • This expansion can lead to a hemodilutional decrease in hemoglobin, masking true iron status.

Purpose of the Study:

  • To clarify the role of hemoglobin and mean corpuscular volume in assessing maternal iron status during pregnancy.
  • To establish optimal hemoglobin concentration ranges for minimizing adverse pregnancy outcomes.
  • To differentiate between physiological anemia of pregnancy and true iron deficiency anemia.

Main Methods:

  • Analysis of hemoglobin concentration and mean corpuscular volume in pregnant women.

Related Experiment Videos

  • Correlation of hematological parameters with pregnancy outcomes such as low birth weight and preterm labor.
  • Evaluation of the impact of plasma volume expansion on hemoglobin levels.

    • Main Results:

    • A hemoglobin concentration below 95 g/L with a mean corpuscular volume below 84 fL likely indicates iron deficiency.
    • Severe anemia (hemoglobin <80 g/L) is linked to small for gestational age infants and preterm birth.
    • Hemoglobin concentrations between 95-105 g/L are associated with the lowest incidence of low birth weight and preterm labor, and may be considered optimal if mean corpuscular volume is >84 fL.
    • Hemoglobin levels >120 g/L in the second trimester increase the risk of preeclampsia and intrauterine growth restriction.

    Conclusions:

    • Mean corpuscular volume is a critical parameter alongside hemoglobin for diagnosing iron deficiency in pregnancy.
    • Specific hemoglobin concentration ranges are associated with optimal and suboptimal pregnancy outcomes.
    • Understanding these hematological markers is vital for effective prenatal care and management of anemia during pregnancy.