Pregnant dating scan accuracy
Occasionally, patients need to return on another day if the baby remains in an unhelpful position.
A nuchal translucency ultrasound is performed with a transabdominal ultrasound.
The early pregnancy scan is the first pregnancy scan that you can have and is not routinely available on the NHS.
It is often done if you are not sure if you are pregnant or to provide reassurance in the very early stages of your pregnancy.
We know that the amount of fluid can increase in the presence of certain conditions, producing a thicker NT measurement.
Conditions associated with an increased NT measurement include some chromosome abnormalities (for example, trisomy 13, 18 and 21) and some structural problems (for example, heart abnormalities).
Occasionally a transvaginal ultrasound is also needed.
It is particularly reassuring for women who have suffered a previous miscarriage or ectopic pregnancy.
An early pregnancy scan will: You can have an early pregnancy scan any time from 5 weeks to 11 weeks and 1 day into your pregnancy.
Transabdominal ultrasound involves scanning through your lower abdomen.
A small amount of ultrasound gel is put on the skin of the lower abdomen, with the ultrasound probe then scanning through this gel.