Screening for Down's syndrome will happen at the dating scan if:. Was this article helpful? The technique does not use any radiation. You will always have a choice about whether transvaginal ultrasound is performed. What can be seen?
Your sonographer will let you know if this is needed.
Ultrasound: A Trimester-by-Trimester Guide
The baby is measured from one end to the other crown-rump-length, or CRL. Identifying pregnancies at increased risk of miscarriage or pregnancy loss. Learn about what it looks for and when it is performed. Some women need to return for another ultrasound scan a few weeks later to assess the progress of the pregnancy, or they may require another blood test serial serum BhCG. Relax—You don't have to brace for needles when you get this painless test. One of the reasons for this is because the heart needs to work harder and more efficiently to pump oxygenated blood around its much larger body and brain. March