Nuchal Translucency Scan - InsideRadiology
At 8 to 14 weeks of pregnancy, usually around 12 weeks, you should be offered a at the back of the baby's neck (nuchal translucency) with an ultrasound scan. Image of an ultrasound examination. A nuchal translucency scan (also called first trimester of pregnancy screening) is carried out during weeks. Your first pregnancy ultrasound scan is likely to be a dating scan. Screening for Down's syndrome involves a nuchal translucency (NT) scan plus a blood test.
At what stage of pregnancy are ultrasound scans usually recommended?
Your pregnancy and baby guide
For women in Australia with an uncomplicated pregnancy, the following ultrasound scans may be recommended. First trimester ultrasound scans A dating scan may be recommended if there is any uncertainty about when conception may have occurred for example, women who have irregular periods and those who are uncertain of the date of their last menstrual period.
Dating scans confirm the age of the pregnancy and provide an accurate due date.
They can also show whether it is a single or multiple pregnancy twins or more. Dating scans can be performed from 6 weeks of pregnancy. The due date can also be confirmed during a nuchal translucency scan or week pregnancy screening scan — see below. A nuchal translucency scan also called a first trimester pregnancy screening scan is usually offered to pregnant women between 11 and 13 weeks.
If the combined test indicates a higher than normal risk, you will be offered further tests. Sometimes other problems can also be detected on ultrasound at this stage of pregnancy.
Second trimester ultrasound scan The 18 to 20 week pregnancy screening scan, also called an anomaly scan, is recommended to check the developing baby. The fetus is also assessed for any major anatomical abnormalities such as problems with the head, limbs, heart and other internal organs. At this stage of pregnancy, the sex of the baby can often be determined. In addition to checking the baby, the position of the placenta, the cervix and the amount of amniotic fluid are also usually assessed during this ultrasound scan.
When might additional ultrasound scans be needed?
week pregnancy dating scan - NHS
Your doctor may also recommend ultrasound scans at other times during the pregnancy. One common reason an ultrasound scan may be done is to check on the growth of the baby if they are measuring small at a routine antenatal visit. Women pregnant with more than one baby e. Your doctor may also recommend having an ultrasound if you have an episode of vaginal bleeding.
Specialised ultrasound scans 3D and 4D ultrasound scans 4D scans are also called live, or moving, 3D ultrasounds show images of the baby in three dimensions. They can provide clear images of the baby, including their face. These detailed images are useful if further detail is needed to assess certain conditions, such as cleft lip or heart problems. What happens during an ultrasound?
When you have a pregnancy ultrasound, a type of gel is spread on your abdomen and a device that produces and receives soundwaves a transducer is moved over your skin. Ultrasound scans that are done very early in pregnancy may need to be done transvaginally.
This means that instead of moving the transducer device over the skin of your abdomen, a narrow device is gently inserted into the vagina to take images of the baby.
The sonographer the health professional performing the ultrasound scan may show you some of the images of your baby on the screen, and may also print some of the images for you. The images will also be reviewed by a radiologist specialist in medical imaging and your obstetrician or midwife.
Preparation for pregnancy ultrasound Before having a pregnancy ultrasound, you are usually asked to drink several glasses of water and to hold off urinating for a period of time, so that you have a full bladder during the examination. This is especially important for early pregnancy scans, as a full bladder pushes your uterus out of the pelvis so that images of the baby can be more easily obtained. Your doctor or the ultrasound clinic or hospital where you are having the scans will give you instructions on how long before the test you should drink the water, and how much to drink.
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. Dating scans are used to confirm how many weeks pregnant you are and your expected due date.
Why would I have a dating scan? A dating scan might be recommended to confirm your due date if you are unsure of your last menstrual period or your date of conception. It is usually offered to pregnant women from 10 weeks to 13 weeks gestation, but can be carried out any time from 6 weeks. If you have had bleeding during your pregnancy or you have had previous miscarriagesyour doctor or midwife may recommend an early dating scan from 6 to 10 weeks gestation.
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. How is a dating scan performed? A dating scan is carried out by ultrasound. A sonographer, who is usually a radiographer or a midwife trained in ultrasound, will complete your scan. If the scan is after 10 weeks, ultrasound recordings are usually made through your abdomen. The sonographer will put gel on your abdomen and move a hand-held device called a transducer, back and forward over your skin.
In some situations, such as when the scan is completed before 10 weeks of gestation or you are overweight, you may also need a vaginal scan.