title: Prediction of the small for gestational age infant: which ultrasonic measurement is best?
abstract: OBJECTIVE
  To determine the most appropriate ultrasonic measurement for the prediction of a small for gestational age (SGA) infant.
  
  
  METHODS
  A literature search of all English language journals over the last 15 years was undertaken. One hundred seventeen articles on the use of morphometric and Doppler ultrasonic measurements in the diagnosis of SGA were reviewed.
  
  
  METHODS
  Studies were included if antenatal and postnatal criteria for diagnosis were clearly defined and data for SGA and normal fetuses were reported, allowing the construction of a 2 x 2 table.
  
  
  METHODS
  Studies with the same criteria were grouped according to whether the population was high or low risk. The sensitivity, odds ratio (OR), and false-positive rate were calculated for each study; summary statistics were then calculated for each ultrasonic measurement provided the individual sensitivities, ORs, and false-positive rates were not significantly different (P > .01).
  
  
  CONCLUSIONS
  In high-risk subjects, abdominal circumference below the tenth percentile had the highest common sensitivity, and estimated fetal weight below the tenth percentile had the highest common OR. In studies in which morphometric and Doppler ultrasonic measurements were compared in the same subjects, the Doppler ORs tended to be lower than the ORs for morphometric measurements. In low-risk subjects, much lower ORs were found for all ultrasonic measurements. The heterogeneous nature of the studies reviewed may have contributed to the different results within each group.
authors.affiliation: Department of Obstetrics and Gynecology, University College Hospital, London, United Kingdom.
authors.forename: T C
authors.initials: TC
authors.lastname: Chang
authors.forename: S C
authors.initials: SC
authors.lastname: Robson
authors.forename: R J
authors.initials: RJ
authors.lastname: Boys
authors.forename: J A
authors.initials: JA
authors.lastname: Spencer
mesh_terms: D005189:False Positive Reactions; D005260:Female; D005333:Fetus / Q000033:anatomy & histology*; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D016017:Odds Ratio; D011237:Predictive Value of Tests; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal