Early pregnancy ultrasound
This is typically performed between 6–10 weeks gestation and confirms the location of and size of the pregnancy. At this time we check for a heartbeat, assesses the number of embryos, and estimates the gestational age and due date.
First trimester ultrasound
This usually done between 11 and 13+6 weeks, it was initially indicated for those looking to understand their risk of common genetic anomalies like Down syndrome. It includes measurements like the head to tail length and nuchal translucency (thickness at the back of the neck) and combines with maternal age and blood tests to assess fetal development and screen for chromosomal abnormalities. Recent advances in technology and specialist imaging services has shown an ultrasound at this early stage can also pick up some abnormalities of the brain, spine, abdominal wall, and limbs. In addition, by measuring the blood flow to the uterus and taking a blood pressure of the mother, we can calculate the risk of developing pre-eclampsia, which if identified and treated early, can reduce the severity of this pregnancy complication.
Morphology ultrasound
This is performed around 18–20 weeks, as a detailed anatomical scan to check for structural abnormalities, assess fetal growth, the placenta, and amniotic fluid, and may reveal the baby's sex.
Third trimester ultrasound
This is typically considered after 28 weeks to monitors fetal growth, position, placental health, amniotic fluid levels, and overall fetal wellbeing.
