title: Ultrasound assessment of fetal biparietal diameter and femur length during normal pregnancy in Iranian women.
abstract: OBJECTIVE
  To determine the pattern of intrauterine growth and predicted biparietal diameter (BPD) and femur length (FL) at point in gestation of Iranian fetuses.
  
  
  METHODS
  In an extensive and long-standing prospective study in Tehran, Iran 15693 BPD and 15594 FL measurements were obtained from the fetuses of 1324 normal pregnant women. Weekly mean values and the standard deviations (S.D. ) were calculated for both BPD and FL from 12 to 40 weeks of pregnancy. Comparison was also made between our results and previous Western studies using t-test analysis.
  
  
  RESULTS
  Iranian fetuses had smaller BPD and shorter FL measurements in comparison with Western studies (P<0.05). There is a lag in BPD growth of our fetuses. The lag in FL growth is even more than BPD. Growth of the BPD and FL showed an asymptotic curve like that of Western studies but both of our values were lower.
  
  
  CONCLUSIONS
  Ethnicity may influence ultrasonic fetal biometric measurements.
authors.affiliation: Department of Obstetrics & Gynecology, Arash Maternity Hospital, Tehran, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Beigi
authors.forename: F
authors.initials: F
authors.lastname: ZarrinKoub
mesh_terms: D000293:Adolescent; D000328:Adult; D005314:Embryonic and Fetal Development / Q000502:physiology; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging* / Q000254:growth & development*; D005865:Gestational Age; D006801:Humans; D007492:Iran; D010294:Parietal Bone / Q000000981:diagnostic imaging* / Q000254:growth & development*; D011247:Pregnancy / Q000502:physiology*; D011336:Probability; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal / Q000379:methods*