Dating / viability

The dating or viability ultrasound can determine gestational age (the number of weeks pregnant) with more precision than using the date of the last menstrual period. It is performed from the 10th week of gestation.

1^st Trimester - Nuchal Clarity

Performed between 11 weeks + 4 days and 13 weeks + 6 days to assess risk for major chromosomic abnormalities. The examination allows a measurement of nuchal translucency and verifies the presence of the nasal bone and major malformations.

2^nd Trimester - Morphology

This is performed between 20 and 22 weeks to assess the fetal anatomy by examining the head, thorax, abdomen, spine, and limbs. If the position of the baby allows it, it may be possible to determine its sex.