The probe is covered with a disposable protective sheath.A small amount of ultrasound gel is placed on the end of this probe.We know that the amount of fluid can increase in the presence of certain conditions, producing a thicker NT measurement.

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

Occasionally a transvaginal ultrasound is also needed.

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.

Combined first trimester screening assesses the risk for your baby having certain chromosomal abnormalities (trisomy 13, 18 and 21).

This testing combines the nuchal translucency ultrasound with specific blood tests.A nuchal translucency ultrasound (commonly called a “nuchal scan” or “NT scan”) is an ultrasound performed between 11.5 and 13 weeks 6 days gestation.It is usually part of an assessment called combined first trimester screening.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.Transabdominal ultrasound involves scanning through your lower abdomen.