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Database - Alliance francophone pour l'accouchement respecté (AFAR)

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Created on : 29 Apr 2004
Modified on : 02 Dec 2007

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Bibliographical entry (without author) :

First trimester ultrasound screening is effective in reducing postterm labor induction rates: A randomized controlled trial. American Journal of Obstetrics and Gynecology 2004;190(4):1077-1081.

Author(s) :

Bennett KA, Crane JMG, O’Shea P, Lacelle J, Hutchens D, Copel JA.

Year of publication :


URL(s) :…

Résumé (français)  :

Abstract (English)  :


This study was designed to test the null hypothesis that first trimester ultrasound crown-rump length measurement for gestational age determination will result in no difference in the rate of induction of labor for postterm pregnancy, compared with second trimester biometry alone.
Study design

Two hundred eighteen women were randomly assigned to receive either first trimester ultrasound screening or second trimester ultrasound screening to establish the expected date of confinement. Sample size was calculated by using a 2-tailed = .05 and power (1-) = 80%. Data were analyzed with 2 and Fisher exact tests.


Of 104 women randomly assigned to the first trimester screening group, 41.3% had their gestational age adjusted on the basis of the crown-rump length measurement. Of 92 women randomly assigned to the second trimester screening group, 10.9% were corrected as a result of biometry (P < .001, relative risk = 0.26, 95% CI = 0.15-0.46). Five women in the first trimester screening group and 12 women in the second trimester screening group had labor induced for postterm pregnancy (P = 0.04, relative risk = 0.37, 95% CI = 0.14-0.96).


The application of a program of first trimester ultrasound screening to a low-risk obstetric population results in a significant reduction in the rate of labor induction for postterm pregnancy.

Sumário (português)  :

Comments :

Argument (français) :

La pratique d’une échographie au premier trimestre permet de réduire les taux de déclenchement pour dépassement de terme. (Essai randomisé)

Argument (English):

Argumento (português):

Keywords :

➡ induction of labor ; physiology ; post-term pregnancy ; ultrasound scanning

Author of this record :

Cécile Loup — 29 Apr 2004

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