title: Accuracy of intrapartum estimates of fetal weight. Effect of oligohydramnios.
abstract: OBJECTIVE
  To study the effect of oligohydramnios on the accuracy of intrapartum clinical and sonographic estimates of fetal weight (EFWs).
  
  
  METHODS
  Intrapartum clinical and sonographic EFWs and an amniotic fluid index (AFI) were obtained on 124 term patients. Oligohydramnios was defined as an AFI < or = 5 cm.
  
  
  RESULTS
  Clinical and sonographic EFWs in women with oligohydramnios were significantly less accurate than estimates derived in patients with normal amniotic fluid: P = .03 and .02, respectively. The incidence of clinical and sonographic EFWs within +/-10% of the actual birth weight were 70.1% and 68.4%, respectively (P = NS).
  
  
  CONCLUSIONS
  In term patients, intrapartum sonographic prediction of birth weight offers no advantage over estimated fetal weight obtained by abdominal palpation. The presence of oligohydramnios significantly reduces the accuracy of intrapartum clinical as well as sonographic EFWs. Therefore, we suggest that intrapartum EFWs be obtained prior to artificial rupture of the membranes.
authors.affiliation: Department of Obstetrics and Gynecology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Barnhard
authors.forename: I
authors.initials: I
authors.lastname: Bar-Hava
authors.forename: M Y
authors.initials: MY
authors.lastname: Divon
mesh_terms: D000653:Amniotic Fluid / Q000737:chemistry; D001724:Birth Weight / Q000502:physiology*; D005260:Female; D005333:Fetus / Q000502:physiology; D006801:Humans; D016104:Oligohydramnios / Q000503:physiopathology*; D011237:Predictive Value of Tests; D011247:Pregnancy; D011248:Pregnancy Complications / Q000503:physiopathology*; D011446:Prospective Studies; D016216:Ultrasonography, Prenatal