title: Updating reference values for placental weights in Northern Alberta.
abstract: OBJECTIVE
  The purpose of this study was to establish normal parameters for placental weights and fetal/placental weight ratios.
  
  
  METHODS
  Placentas (2402) from uncomplicated singleton deliveries at the Royal Alexandra Hospital (Edmonton, Alberta) were collected from 1997 to 1998 and weighed after fixation. The nonparametric Mann-Whitney test was applied.
  
  
  RESULTS
  New reference values were developed for fixed placental weights. Placentas at the 90th percentile were 50 to 100 g heavier than previously reported. Fetal/placental weight ratios at term were similar to published values.
  
  
  CONCLUSIONS
  The new placental weight reference values from our institution represent a recent and local population. New values may partly reflect parallel increases in term birth weights.
authors.affiliation: Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.colleen_dy@hotmail.com
authors.forename: Colleen L
authors.initials: CL
authors.lastname: Dy
authors.forename: Radha S
authors.initials: RS
authors.lastname: Chari
authors.forename: Laurie J
authors.initials: LJ
authors.lastname: Russell
mesh_terms: D000416:Alberta; D001724:Birth Weight; D015331:Cohort Studies; D005260:Female; D020567:Fetal Weight; D006801:Humans; D007231:Infant, Newborn; D009929:Organ Size; D010920:Placenta / Q000033:anatomy & histology*; D011237:Predictive Value of Tests; D011247:Pregnancy; D012016:Reference Values; D013223:Statistics as Topic; D018709:Statistics, Nonparametric