Serial third trimester ultrasound examinations in predicting fetal weight
Nilgün Güdücü 1 * , Gökçenur Gönenç, Herman İşçi, Alin Başgül Yiğiter, İlkkan Dünder
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1 İstanbul Bilim University, Department of Obstetrics and Gynecology, İstanbul, Turkey* Corresponding Author


Objective: The aim of this study was to compare the ac­curacy of estimated fetal weights obtained by ultrasonog­raphies performed at different weeks in the third trimester and just before delivery.
Methods: A total of 664 patients underwent three serial ultrasonographic examinations in the third trimester. The sonographically estimated fetal weight was calculated us­ing the Hadlock formula and then converted into percen­tiles. The estimated fetal weight percentiles were com­pared with the actual birth weight percentiles at delivery.
Results: Mean maternal age was 30±4 years (18-42 years), mean gestational age at first ultrasound was 32±0.5 weeks (30.4-33.6 weeks), mean gestational age at second ultrasound was 36±0.4 weeks (35-36.9 weeks), mean gestational age at third ultrasound was 38.6±1 weeks (36.3– 42 weeks). Mean gestational age at deliv­ery was 39± 1 weeks (36-42 weeks), mean birth weight was 3422±423 grams (1900-4900 grams). Correlation coefficients of estimated fetal weights percentiles at first, second and third ultrasounds were significantly correlated with birth weight percentiles (r=0.556, p<0.001), (r=0.623, p<0.001), (r=0.747, p<0.001, respectively).
Conclusion: Ultrasonographic fetal weight estimations correlate with the actual birth weight better when per­formed in the late third trimester, but ultrasonographic fe­tal weight estimation early in the third trimester may allow for better follow up and planning of delivery both in small and large for gestational age fetuses.


This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Article Type: Research Article

J Clin Exp Invest, 2013, Volume 4, Issue 1, 28-33

Publication date: 14 Mar 2013

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Article Downloads: 1036

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