Third trimester ultrasound
The third trimester ultrasound is performed between week 30 and week 32 of pregnancy and assesses your baby's final growth and their readiness for birth. It provides crucial information about the baby's condition and the mother's health in these last weeks of pregnancy.
How is the third trimester ultrasound performed?
It is performed in the same way as the previous ultrasounds, non-invasively and transabdominally.
It can take slightly longer than the earlier ultrasounds, depending on the baby's position and on the measurements needed.
It is essential to confirm that the baby continues to grow and develop correctly in the final weeks of pregnancy. It also helps confirm the baby's position and monitor the health of the placenta and amniotic fluid, factors that matter for a safe birth.
When this ultrasound is performed
This exam takes place between 30 and 32 weeks of gestation, because this is the period in which the baby's final growth and position can be reliably assessed, without yet being too close to the expected date of delivery.
If you have questions about your exact gestational age or when to book this exam, our gynecology and obstetrics team can help clarify during a routine appointment.
Benefits of the third trimester ultrasound
Monitoring the baby's growth
Confirms that the baby is growing as expected in the final stage of pregnancy.
Checking the baby's position
Helps plan the type of birth and identify any need for early intervention.
Placenta and amniotic fluid
Monitors the baby's environment, supporting the early detection of complications.
Aspects assessed during the exam
Fetal growth
Assesses the baby's growth through measurements such as head circumference, abdominal circumference and femur length, confirming whether they match the expected range for the gestational age.
The baby's position
Determines whether the baby is in the right position for birth. If they are breech or transverse, the type of birth may need to be planned further in advance.
Condition of the placenta
Assesses the position and function of the placenta, helping to prevent complications such as placental insufficiency.
Amount of amniotic fluid
Checks amniotic fluid levels, which matter for the baby's wellbeing. Levels outside the expected range can point to potential complications.
Monitoring higher-risk pregnancies
For mothers with risk factors such as hypertension or gestational diabetes, this ultrasound is especially important to monitor the impact of these conditions on the baby's development at this final stage.
Common questions about the exam
Can the third trimester ultrasound predict how the birth will go?+
It helps plan the birth by confirming the baby's position (cephalic, breech or transverse) and by assessing the condition of the placenta and amniotic fluid, information your obstetrician uses to decide on the best approach.
Why is this ultrasound performed between weeks 30 and 32?+
This is the period in which the baby's final growth and position can be reliably assessed, without yet being too close to the expected date of delivery.
Is this the last ultrasound of the pregnancy?+
In most pregnancies without complications, it is usually the last routine ultrasound. In higher-risk pregnancies, your obstetrician may recommend additional exams up to the birth.
Do I need to prepare for the exam in any way?+
No special preparation is required. Our team clarifies any specific instructions when the appointment is booked.
Book your third trimester ultrasound
An assessment of your baby's final growth and readiness for birth, with full safety and specialized care.
