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document
Does a first trimester dating scan using crown rump length measurement reduce the rate of induction of labour for prolonged pregnancy ? An uncompleted randomised controlled trial of 463 women . OBJECTIVE To evaluate the effect of a first trimester ultrasound dating scan on the rate of induction of labour for prolonged pregnancy . DESIGN Randomised controlled trial to include 400 women in each arm of the trial . SETTING Participating general practices and a district general teaching hospital . POPULATION Women attending their general practitioner in the first trimester to confirm pregnancy , in whom a first trimester ultrasound scan was not indicated . METHODS Women randomised to the study group ( scan group ) underwent an ultrasound dating scan between 8 and 12 weeks , measuring crown-rump length . The estimated date of delivery ( EDD ) was changed if there was a discrepancy of more than 5 days from the gestation , calculated from the last menstrual period ( LMP ) . For the remaining women ( no-scan group ) , gestation was determined using the LMP . MAIN OUTCOME MEASURES The rate of induction of labour for prolonged pregnancy . RESULTS Due to circumstances beyond the researchers ' control , recruitment was abandoned when 463 women had been enrolled . The EDD was adjusted in 13 ( 5.7 % ) women in the scan group and in 2 ( 0.9 % ) in the no-scan group . There was no difference in the rate of induction for prolonged pregnancy between the scan ( 19 [ 8.2 % ] ) and the no-scan ( 17 [ 7.4 % ] ) groups ( relative risk 1.10 ; 95 % CI 0.59-2.07 ) . CONCLUSIONS Acknowledging the reduced numbers recruited for study , it is concluded that there is no evidence that a first trimester ultrasound dating scan reduces the rate of induction of labour for prolonged pregnancy and may result in a more expensive healthcare strategy .
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Intervention_Physical
ultrasound dating scan
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Intervention_Physical
ultrasound scan
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Intervention_Physical
ultrasound dating scan
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Intervention_Physical
ultrasound dating scan
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Outcome_Physical
rate of induction of labour
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Outcome_Physical
prolonged pregnancy
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Outcome_Other
rate of induction of labour
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Outcome_Physical
prolonged pregnancy
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Outcome_Other
The rate of induction of labour for prolonged pregnancy
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Outcome_Physical
rate of induction
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Outcome_Physical
prolonged pregnancy
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Outcome_Other
rate of induction of labour
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Outcome_Physical
prolonged pregnancy
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Participant_Sample-size
463
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Participant_Sex
women
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Participant_Sample-size
400
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Participant_Sex
women
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Participant_Sex
Women
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Participant_Condition
first trimester
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Participant_Condition
pregnancy
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Participant_Sample-size
463
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Participant_Sex
women