title: Evaluation of hemoglobin performance in the assessment of iron stores in feto-maternal pairs in a high-risk population: receiver operating characteristic curve analysis.
abstract: OBJECTIVE
  By applying receiver operating characteristic curve analysis, the objective of this study was to see whether hemoglobin levels reflect body iron stores in a group of pregnant women at term who, by using serum ferritin as the reference test, had a high pre-test probability of having iron deficiency anemia. Likewise, we evaluated the ability of hemoglobin and maternal serum ferritin levels to predict iron deficiency anemia in newborns.
  
  
  METHODS
  Hemoglobin and serum ferritin were measured in 187 pregnant women at term belonging to a group with a high pre-test probability of iron deficiency anemia and their newborns. Women with Hb <11.0g/dL and newborns with cord Hb <13.0g/dL were classified as anemic. A serum ferritin <12.0μg/L in women and a cord blood serum ferritin <35.0μg/L were considered to reflect empty iron stores. Receiver operating characteristic curve analysis was applied to select the cut-off points that better reflected iron stores.
  
  
  RESULTS
  The Hb cut-off point selected by receiver operating characteristic curve analysis in women was <11.5g/dL (sensitivity: 60.82, specificity: 53.33%, Youden Index: 0.450). Most of the newborns had normal Hb which precluded this analysis. Maternal Hb <11.0g/dL was the cut-off point that best reflected iron deficiency anemia in newborns (sensitivity: 55.88%, specificity: 57.24%, Youden Index: 0.217). The best cut-off point of maternal serum ferritin to reflect empty iron stores in newborns was <6.0μg/L (sensitivity: 76.47%, specificity: 31.58%, Youden Index: 0.200).
  
  
  CONCLUSIONS
  Hemoglobin concentration performed poorly to detect iron deficiency anemia in women at term with high risk for iron deficiency and their newborns.
authors.affiliation: Universidad Autónoma de Nuevo León, Monterrey, Mexico. Electronic address: carjaime@hotmail.com.
authors.forename: José Carlos
authors.initials: JC
authors.lastname: Jaime-Pérez
authors.affiliation: Universidad Autónoma de Nuevo León, Monterrey, Mexico.
authors.forename: Gisela
authors.initials: G
authors.lastname: García-Arellano
authors.affiliation: Universidad Autónoma de Nuevo León, Monterrey, Mexico.
authors.forename: Nereida
authors.initials: N
authors.lastname: Méndez-Ramírez
authors.affiliation: Universidad Autónoma de Nuevo León, Monterrey, Mexico.
authors.forename: Óscar
authors.initials: Ó
authors.lastname: González-Llano
authors.affiliation: Universidad Autónoma de Nuevo León, Monterrey, Mexico.
authors.forename: David
authors.initials: D
authors.lastname: Gómez-Almaguer
keywords: Anemia, Iron-deficiency; Diagnostic tests, Routine; Ferritins