First trimester dating ultrasound accuracy

It is important for the measurement to be done properly to ensure an accurate result.

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We may need a closer look at your baby, ovaries or cervix.

Transvaginal ultrasound during all stages of pregnancy, including the first trimester, is safe and will not harm either you or your baby.

Chorionic villus sampling and amniocentesis are invasive tests, involving putting needles into the placenta or amniotic sac, and they are associated with an increased risk of miscarriage.

For more information of prenatal diagnostic testing, please go to: The nuchal translucency is the fluid found at the back of your baby’s head and neck, just beneath the skin.

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.

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.

The gel helps improve contact between the probe and your skin.

Occasionally a transvaginal ultrasound is also needed.

This means that combined first trimester screening simply tells us if your risk is low or high.

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