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Original ArticleOpen Access
Charts of Thai Fetal Biometries: 2. Biparietal Diameter
Siwadune T 
,
Sunsaneevithayakul P ,
Titapant V ,
Boriboonlzirunsarn D ,
Kanokpongsakdi S
,
Sunsaneevithayakul P ,
Titapant V ,
Boriboonlzirunsarn D ,
Kanokpongsakdi S A cross-sectional study was conducted in order to construct a new reference chart for
Thai fetal biparietal diameter (BPD). A total of 621 normal pregnant women between 12-41
weeks of gestation and their fetuses were recruited. Measurements were made once at a randomly
assigned gestational age specifically for the purpose of this study only. Due to unfavorable fetal
position in some cases, BPD data were available in 613 measurements. Linear regression
models were fitted separately to estimate the mean and standard deviation as functions of ges-
tational age. Reference centiles were constructed from both equations, assuming the data were
normally distributed. A new reference centiles chart for BPD is presented and compared with
previously published data. Our derived centiles were clearly lower than those from Western
studies showing the importance of racial differences between populations. This elucidates the
need to develop fetal biometries charts specifically for each region.
Key word : Fetal Biometries, Biparietal Diameter, Reference Centiles
Thai fetal biparietal diameter (BPD). A total of 621 normal pregnant women between 12-41
weeks of gestation and their fetuses were recruited. Measurements were made once at a randomly
assigned gestational age specifically for the purpose of this study only. Due to unfavorable fetal
position in some cases, BPD data were available in 613 measurements. Linear regression
models were fitted separately to estimate the mean and standard deviation as functions of ges-
tational age. Reference centiles were constructed from both equations, assuming the data were
normally distributed. A new reference centiles chart for BPD is presented and compared with
previously published data. Our derived centiles were clearly lower than those from Western
studies showing the importance of racial differences between populations. This elucidates the
need to develop fetal biometries charts specifically for each region.
Key word : Fetal Biometries, Biparietal Diameter, Reference Centiles
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