gestational age assessment (ultrasound in pregnancy)

Last reviewed 01/2018

• gestational age assessment:
  • pregnant women should be offered an early ultrasound scan between 10 weeks 0 days and 13 weeks 6 days to determine gestational age and to detect multiple pregnancies. This will ensure consistency of gestational age assessment and reduce the incidence of induction of labour for prolonged pregnancy
  • crown-rump length measurement should be used to determine gestational age
    • if the crown-rump length is above 84 mm, the gestational age should be estimated using head circumference

Reference:

• (1) NICE (March 2008). Antenatal care