Second trimester morphology ultrasound
The second trimester morphology ultrasound is one of the most important exams of the whole pregnancy. Performed between week 20 and week 22, this is the stage at which the baby is more developed, allowing a far more detailed assessment of their anatomy, growth and wellbeing than in earlier ultrasounds.
How is the second trimester ultrasound performed?
The ultrasound is non-invasive and is performed transabdominally. The procedure is quick, painless and safe, for both mother and baby.
The length of the exam can vary depending on the baby's position and on whether more detailed measurements are needed.
It is essential to confirm that the baby is developing correctly. It allows for early detection of potential structural issues and helps monitor the baby's growth, ensuring appropriate care throughout the rest of the pregnancy.
When this ultrasound is performed
This exam takes place between 20 and 22 weeks of gestation, because this is the period in which the baby has developed enough anatomically to allow a detailed assessment of organs and structures, without yet being so large that visibility becomes difficult.
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 second trimester ultrasound
Detection of structural abnormalities
Identifies structural changes in the baby, helping to detect congenital malformations.
Monitoring the baby's growth
Assesses fetal growth, ensuring healthy development.
Peace of mind for parents
Offers a detailed view of the baby, with greater reassurance about their wellbeing.
Aspects assessed during the exam
The baby's morphological development
Examines the development of the baby's main organs and structures, including the brain, heart, kidneys, liver, stomach, bones and limbs.
Assessment of the placenta
Assesses the position and function of the placenta, also checking for issues such as placenta praevia.
Amount of amniotic fluid
Ensures there is an adequate amount of amniotic fluid, essential for the baby's development.
The baby's sex
In many cases the baby's sex can already be identified, provided they are in a favourable position during the exam.
The baby's measurements
Measurements such as femur length, abdominal circumference and head diameter are recorded, allowing the baby's growth to be assessed and confirmed against the expected range for the gestational age.
Common questions about the exam
Can I find out the baby's sex at this ultrasound?+
Yes, in most cases. If the baby is in a favourable position during the exam, the sex can be identified at this stage.
Why is the second trimester ultrasound performed between weeks 20 and 22?+
This is the period in which the baby has developed enough anatomically to allow a detailed assessment of organs and structures, without yet being so large that visibility becomes difficult.
Does this ultrasound replace the first trimester ultrasound?+
No. They are complementary exams, each with its own purpose: the first trimester ultrasound focuses on dating the pregnancy and on nuchal translucency, while the second trimester ultrasound assesses the baby's anatomy in detail.
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 second trimester ultrasound
A detailed assessment of your baby's anatomy and growth, with full safety and specialized care.
