nt scan date

It is usually part of an assessment called combined first trimester screening. Combined first trimester screenings Combined first trimester screening assesses the risk for your baby having certain chromosomal abnormalities trisomy 13, 18 and This testing combines the nuchal translucency ultrasound with specific blood tests.

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Nuchal translucency ultrasound alone can also provide this risk assessment, but it is not as accurate as combined first trimester screening. Combined first trimester screening is a non-invasive way of assessing your risk, which means it does not involve putting needles into the placenta nt scan date amniotic sac, as happens with CVS nt scan date amniocentesis. This means that combined first trimester screening simply tells us if your risk is low or high. For example, it tells us whether your baby has a low risk of having trisomy 13, 18 or 21, or whether your baby has a high risk of having trisomy 13, 18 or This test gives us an indication of whether we should worry about your baby based on these results.

This means that combined first trimester screening will not give us a definitive answer. 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.

The thickness of this fluid can be precisely measured and this is called the nuchal translucency or NT measurement. Normally the amount of fluid is small, producing a thin NT measurement. We know that nt scan date amount of nt scan date 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. An increased NT measurement does not always mean the baby has a problem but it does increase the risk.

There are established and strict criteria for the accurate measurement of the nuchal translucency. It is important for the measurement to be done properly to ensure an accurate result. If your baby is not co-operating and the NT cannot be measured accurately, we may ask you to return for more images later in the day. Occasionally, patients need to return on another day if the baby remains in go here 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. 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.

Your sonographer will be experienced at performing these ultrasounds during pregnancy. Transvaginal ultrasound is an internal ultrasound.

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It involves scanning with the ultrasound probe lying in the vagina. The transvaginal ultrasound probe is thin, about 2cm diameter. The probe is covered with a disposable protective sheath. A small amount of ultrasound gel is placed on nt scan date end of this probe. The probe is then gently inserted a short distance into the vagina by the sonographer.

All transvaginal probes have been cleaned and sterilised according to recommended protocols. Performing the transvaginal ultrasound usually causes less discomfort than a pap smear.]

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