title: Comparison of ultrasound fetal biometry of singleton fetuses with a reference chart in pregnant women with normal nutritional and health status
abstract: The aim of this study was to compare fetal
  biometry of singleton fetuses in pregnant women with
  normal nutritional and health status in the Ampara district,
  with a commonly used reference chart.
  
  
  
  A cross sectional study was carried out in the
  Ampara District. Women with normal nutritional and health
  status and minimal environmental constraints on fetal
  growth (n=714) were enrolled during the first trimester and
  gestational age was confirmed by fetal crown-rump length
  measurement between 11 weeks + 0 days and 13 weeks +
  6 days. For this study, each mother was considered only
  once for measurement of fetal biometry, at gestations
  between 11 and 41 weeks. Fetal bi-parietal diameter (BPD),
  head circumference (HC), abdominal circumference (AC)
  and femur length (FL) were measured using standard
  techniques, and separate regression models were fitted to
  estimate the means and standard deviations and derive
  gestation specific centiles for each parameter, assuming
  that the measurements have a normal distribution at each
  gestational age. The fetal biometry results obtained from
  the current study were compared with a commonly used
  reference chart.
  
  
  
  The fitted 10th, 50th and 90th centiles at 40 weeks
  of gestation were, 87.9 mm, 93.2 mm and 98.5 mm for
  BPD, 313.8 mm, 328.9 mm and 344.0 mm for HC; 298.2
  mm, 322.5 mm and 346.9 mm for AC and 69.7 mm, 75.0
  mm and 80.2 mm for FL. When compared with the
  reference chart, significant differences of fetal biometry were
  seen in the third trimester but not in the second trimester.
  
  
  
  Ultrasound fetal biometry of singleton fetuses
  in pregnant women with normal nutritional and health status
  in the Ampara District were significantly different in the third
  trimester, from a routinely used reference chart.
authors.affiliation: District General Hospital, Ampara, Sri Lanka. thiran_dias@yahoo.com|Faculty of Medicine University of Kelaniya, Sri Lanka.
authors.forename: Tiran
authors.initials: T
authors.lastname: Dias
authors.forename: D
authors.initials: D
authors.lastname: Chandrasiri
authors.forename: S
authors.initials: S
authors.lastname: Abeykoon
authors.forename: C
authors.initials: C
authors.lastname: Gunawardena
authors.forename: G
authors.initials: G
authors.lastname: Pragasan
authors.forename: T
authors.initials: T
authors.lastname: Padeniya
authors.forename: A
authors.initials: A
authors.lastname: Pathmeswaran