When is the best time to get a 3D ultrasound?
Prenatal diagnosis
Ultrasound technology and imaging
Ultrasonography, also known as ultrasound, is a medical imaging technique that uses high-frequency sound waves to create visual representations of the interior of the body, including organs, tendons, and muscles. The images produced by this process are called sonograms.
The importance of 3D sonography
3D sonography, which creates three-dimensional images of an object, provides a more detailed view of internal organs and structures compared to its predecessor, 2D sonography. This advanced technology allows clinicians to visualize the fetal face, limbs, and other body parts in incredible clarity during pregnancy.
When to consider a 3D ultrasound
When you are pregnant
Prenatal sonography is routinely offered to pregnant women, with the majority receiving a 2D ultrasound in their first trimester and a 3D ultrasound between 18 to 24 weeks of gestation (1). At around 20 weeks, the outline of the baby's body may become visible, and 3D sonography becomes more suitable during the second trimester.
When there are specific medical concerns
Although routine 2D sonograms from 18 to 20 weeks suffice for assessing the孕囊 (the blastocyst) and evaluating the corpus callosum in the brain (2), some healthcare providers may recommend a 3D ultrasound to further evaluate any potential risk factors and provide a higher-quality view of structures to assess for abnormalities.
During multiples
For instance, if there are two or more embryos present in the placenta, a 3D sonography may be performed at 18 weeks to align the foetuses in different multiples and to help the sonographer arrange them within the field of view of the transducer.
For late pregnancy planning
In cases where the woman is at risk of preterm labor or needs to know the exact size of the baby to plan an appropriate cesarian, a 3D ultrasound at 28 weeks may be recommended.
For better bonding and keepsake
For many, the primary reason for a 3D or 4D ultrasound is to have ultrasound scans that can be cherished as keepsakes and to enhance bonding experiences with an unborn child. Advances in 3D and 4D ultrasonography enable the capture of clear full-face images during late pregnancy.
Timing considerations
The optimal time range for 3D sonography
The ideal time for a 3D ultrasound typically ranges from 24 to 28 weeks of gestation when the fetal face is more round and fully developed, facial features are distinct, and the angle of the transducer is optimal (3).
The impact of the menstrual cycle on 3D sonography
A study published in the journal "Ultrasound in Medicine and Biology" indicated that the menstrual cycle duration in the early to mid-trimester influences the quality of 3D/4D sonograms performed during these periods. However, in practice, the menstrual cycle may influence the choice of an ultrasound examination, particularly if it is being used to guide the timing of an imaging examination in individuals with a regular menstrual cycle (4).
Preparation and expectations
For women preparing for a 3D or 4D ultrasound at home, eating a light snack an hour before the appointment and staying hydrated by drinking plenty of water are general recommendations to ensure that the amniotic fluid volume is optimal for imaging (5).
Conclusion
In conclusion, timing is crucial when seeking a 3D ultrasound. The best time to undergo a 3D ultrasound is between 24 and 28 weeks of pregnancy, as this period yields the most satisfactory images of the fetal face and overall development. In many cases, 3D sonography is a supplementary test to enhance the evaluation by providing a detailed view of the fetal organs and helping to detect any potential congenital abnormalities. It is important for healthcare providers to consider the individual clinical situation and provide guidance to mothers regarding the timing of this diagnostic study based on their unique presentation and any specific medical risks.
