Screening for Down Syndrome

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Your pregnancy – What to expect

Women also have routine blood tests or ‘blood screening’ to find out the mother’s blood group and several other things. For more information on screening tests please see ‘Resources ‘. Though all the pregnancies considered here began in the usual way with early scans and blood test screening, they all differed subsequently because the baby was found to have problems. See also ‘Having the week scan and further tests’. The first scan was to check the make-up of the baby – check that there was a heartbeat, check that their arms, legs, head and measure the length of the baby from crown to rump really.

This is known as ‘combined screening’ because it involves an ultrasound scan (​the ‘nuchal translucency scan’) and a blood test. The optimum time for the nuchal​.

The scan may also show if you are expecting a baby girl or boy. The hospital will not offer you another scan if this is the case. The person performing the scan is called a sonographer. The sonographer will put gel onto your tummy to start the examination. The gel usually feels cold and you may feel a little discomfort when the ultrasound probe transducer presses on your tummy. An ultrasound scan takes approximately 10 minutes to complete. A screen will be visible for you to also see what the sonographer is looking at.

It is advised you have a full bladder, when having a scan. This helps the ultrasound echoes to reach your womb, giving them a better view of your baby. The transducer sends high frequency sound waves in your abdomen to build a picture of the baby. These waves bounce off your baby and back to the computer to be translated into a picture.

Antenatal screening

If you attend without a suitable face covering single-use masks are available to buy at the time of your appointment, subject to availability. Your blood needs to be taken either by us at the time of your appointment or privately by your midwife, GP or local phlebotomist. When you book online, depending on your chosen location you may be contacted to arrange the most convenient way for you to have this done close by.

Will the dating scan happen at exactly 12 weeks? The nuchal translucency scan is usually done at the same time and done in conjunction with a blood test.

If you have a new continuous cough , a high temperature , or a loss or change to your sense of taste or smell , do not come to our hospitals. Follow the national advice. Patients and visitors must wear a face covering in our hospitals. This site is best viewed with a modern browser. You appear to be using an old version of Internet Explorer. This early ultrasound scan provides important information about the number of babies present and the expected date of delivery. Pregnancy and the fetal heart can be seen from six weeks gestation by vaginal scan, and from eight to nine weeks by abdominal scan.

Accurate measurements and images are taken of the gestational sac and the ‘crown to rump’ length of the embryo, to accurately date the pregnancy. Please see ‘Screening’ for further information.

Dating scan

The main purpose of a dating scan is to check the stage of pregnancy and therefore when the baby is due. Measuring the baby can be more accurate than dating by the last menstrual period. It is also an opportunity to check the baby is alive and developing as expected, and check for twins.

Nuchal Translucency Scan – This is also offered to pregnant mums at the same time as the Dating Scan. This assesses the risk of Down Syndrome in babies.

Nuchal translucency is the name for the normal fluid space behind the neck of a foetus unborn baby that can be seen on ultrasound scans. A nuchal translucency scan also called first trimester of pregnancy screening is carried out during weeks 11—13 of a pregnancy. The scan uses ultrasound to screen for Down syndrome, or other chromosomal or inherited conditions in the foetus.

Other non-chromosomal conditions, such as neural tube defects, abdominal wall defects, limb abnormalities and some congenital heart disease, can also be detected at this stage of the pregnancy. Screening can determine the likelihood of risk of an abnormality, but does not diagnose the condition. If screening does identify a possible risk, it does not necessarily mean there is an abnormality present, but does mean that further testing is necessary.

Nuchal Translucency Screening

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Screening Tests.

Nuchal translucency (NT) is the appearance on a scan, of a collection of fluid under the skin behind What happens now I know that my baby has a raised NT​? At your appointment with a Date of publication: June Date of review: June.

Log in Sign up. Community groups. Home Pregnancy Health Antenatal scans. In this article What is nuchal translucency? Why might I have a nuchal scan? How is the nuchal scan performed? How accurate is the nuchal scan? What is a normal nuchal translucency measurement?

Dating scans

All women will be offered ultrasound scans of their baby at around 12 and 20 weeks. Ultrasound scanning has been used extensively in pregnancy and is accepted to be safe. This scan also measures the baby and estimates how many weeks pregnant you are.

Learn about anatomy, dating, biophysical profile, nuchal translucency scans, what to expect, exam What Happens During my Obstetric Ultrasound?

OHSU brings you safe, excellent care — in person and in virtual visits. Call your clinic or see MyChart for details. This scan is carried out from 11 weeks to 13 weeks and six days. The scan is usually performed transabdominally but in a few cases it may be necessary to do the examination transvaginally. Nuchal translucensy NT is the clear space in the tissue of your developing baby’s neck.

An NT measurement can help your healthcare practitioner assess your baby’s risk of having down syndrome and some other chromosomal abnormalities as well as major congenital heart problems. Major abnormalities may be visible at this gestation. We will check whether your baby has all its limbs, that the head and brain appear to be developing normally, that the baby has a visible stomach and bladder and the umbilical cord is inserted correctly.

From 12 weeks the spine can usually be seen clearly enough to rule out major cases of spina bifida. All of this information provides important reassurance. A more thorough evaluation of fetal anatomy will be done at weeks gestation. Your NT measurement cannot be used alone to calculate the risk that your baby has down syndrome or another genetic abnormality.

If there is any indication of a problem or abnormality, we will discuss the results with you carefully.

Ultrasound-Obstetric screening tests

The browser you are using is too old for our website. Please visit www. Learn why the dating scan is carried out, why your due date might change, and get tips to help you prepare for your appointment. Discover the science behind your baby’s developments, week-by-week. Although sometimes known as the reassurance and viability scan, your 12 week scan is more typically referred to as the dating scan.

The scan, when combined with 1st trimester biochemical screening (bHCG, PAPP-A) has The patient’s LNMP if known, and date of 1st positive pregnancy test;.

A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Read on for more information about what a dating scan offers. A dating scan might be recommended before 12 weeks to confirm your due date if you are unsure of your last menstrual period or your date of conception. The scan is optional and not everyone will have it. You can discuss whether you want or need a dating scan with your doctor or midwife.

If you choose to have a dating scan, it will most probably be your first scan. You will need to get a referral from your doctor or midwife for a dating scan. Most women can instead have their first scan at 11 to 13 weeks — this is usually called the week scan. A dating scan is carried out by ultrasound.

Ultrasound scans during pregnancy

Log in Sign up. Home Pregnancy Health Antenatal scans. In this article When will I have my dating scan?

Find out why and when you may be offered a dating scan, how accurate it is at For most Australian mums-to-be, the first scan will be a nuchal translucency (NT) scan between That will happen at your NT scan and week (anomaly) scan.

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The Groves

Please note that our website only supports modern browsers. In order to properly experience our website you should upgrade your web browser to a current version. Please visit one of the following links to upgrade to the current version of a modern browser. Down syndrome is caused by the presence of an extra chromosome number 21 in the cells of the developing baby. In an unscreened population, about one in every babies is born with Down syndrome.

Guidance for screeners on the 12–13+6 week scan from the New Zealand Dating of pregnancy; Early anatomy assessment; Detection of multiple If nuchal cord is present, measure the NT both above and below the cord.

A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period.

By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 – 5 days of accuracy.

The most accurate time is between 8 and 11 weeks gestation.

How to perform Nuchal Translucency Scan