The relationship between frequency of obstetric ultrasound scans and birthplace preference – A case control study

James Harris, Linda S. Franck, Belinda Green, Stephanie Wilson, Susan Michie

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


to investigate the relationship between frequency of ultrasounds and birthplace preference.

Study design
retrospective case-control study with the number of ultrasounds as the exposure and the pregnant woman׳s preference to give birth in a low-technology setting (midwifery-led unit or home) or a high-technology setting (obstetric unit) as the primary outcome.

Sample and Setting
low-risk primigravid women receiving antenatal care at a central London academic medical centre.

antenatal ultrasound frequency; birthplace preference at the initial pregnancy appointment (T1) and at the commencement of labour (T2); demographic data including ethnicity, index of multiple deprivation, age, and body mass index.

1100 cases were reviewed. Women received an average of 4.03 ultrasounds during their pregnancy (SD=1.96, range 2–14). The frequency of ultrasounds for women who had a low-technology T2 birthplace preference was significantly lower than for those who had a high-technology T2 birthplace preference (t=2.98, df=1098, p=0.003, r=0.1), and women who had a constant low-technology birthrate preference had significantly less ultrasounds than other women (F (3,644)=3.475, p=.02). However, within a logistic regression the frequency of ultrasound was not associated with T2 birthplace preference, after controlling for T1 birthplace preference.

Key conclusions
the findings of this investigation suggest that a preference made early in pregnancy is a greater predictor of birthplace preference than exposure to antenatal ultrasounds.

Implications for practice
further research is required to inform interventions that would encourage low-risk pregnant women to select a low-technology place of birth.
Original languageEnglish
Pages (from-to)31-36
Number of pages6
Issue number1
Publication statusPublished - Jan 2015


  • Place of birth choice; Ultrasound frequency; Low-risk pregnancy; Medicalisation


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