ultrasound screening in the 1st and 2nd trimester
Last reviewed 01/2018
Ultrasonography can be used for the following:
- diagnosis of pregnancy
- abortion
- ectopic pregnancy
- hydatidiform mole
- multiple pregnancy
- dating a pregnancy
- detection of congenital abnormality
- guidance of invasive procedures
Notes (1):
- 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:
diagnosis of ectopic pregnancy
diagnosis of hydatidiform mole
diagnosis of multiple pregnancy
detection of congenital abnormality
guidance of invasive procedures