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Original ArticleOpen Access
The Relationship of Fetal Heart Rate at 10-14 Weeks and Birthweight at Term
Panburana P 
,
Ajjimakom S ,
Tangkajiwangkoon P
,
Ajjimakom S ,
Tangkajiwangkoon P The purpose of this study was to examine the correlation between the fetal heart rate at
10-14 weeks and birthweight at term. At the fetal medicine unit, Ramathibodi Hospital, the
screening for Down's syndrome at 10-14 weeks' gestation by ultrasound has been ongoing since
January 1997. Transabdominal ultrasound examination is routinely performed for the crown-rump
length, nuchal translucency thickness and fetal heart rate. The fetal heart rate is measured over
four to six cardiac cycles by using the pulsed Doppler technique. One thousand and fourtei!n term
singleton pregnancies that resulted in phenotypically normal live births were studied. The study
was done was carried out at 10-14 weeks of gestation (mean 12.27 weeks) from January 1997 to
November 1997. The mean patient age was 26.78 years old. The mean gestational age and
birthweight were 38.83 weeks and 3,097.83 grams respectively. The incidence of low birth-
weight (less than 2,500 grams) was 14.2 per cent. Regression analysis demonstrated no significant
relation between fetal heart rate at 10-14 weeks and birthweight at term. In conclusion, the result
of this study revealed that there was no correlation of the fetal heart rate at 10-14 weeks' gestation
and birthweight at term.
Key word : Fetal Heart Rate, 10-14 Weeks Gestation
10-14 weeks and birthweight at term. At the fetal medicine unit, Ramathibodi Hospital, the
screening for Down's syndrome at 10-14 weeks' gestation by ultrasound has been ongoing since
January 1997. Transabdominal ultrasound examination is routinely performed for the crown-rump
length, nuchal translucency thickness and fetal heart rate. The fetal heart rate is measured over
four to six cardiac cycles by using the pulsed Doppler technique. One thousand and fourtei!n term
singleton pregnancies that resulted in phenotypically normal live births were studied. The study
was done was carried out at 10-14 weeks of gestation (mean 12.27 weeks) from January 1997 to
November 1997. The mean patient age was 26.78 years old. The mean gestational age and
birthweight were 38.83 weeks and 3,097.83 grams respectively. The incidence of low birth-
weight (less than 2,500 grams) was 14.2 per cent. Regression analysis demonstrated no significant
relation between fetal heart rate at 10-14 weeks and birthweight at term. In conclusion, the result
of this study revealed that there was no correlation of the fetal heart rate at 10-14 weeks' gestation
and birthweight at term.
Key word : Fetal Heart Rate, 10-14 Weeks Gestation
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