- Nuchal scan
- Why would I have a dating scan?
- How is a dating scan performed?
- week pregnancy dating scan: what will it tell me? | MadeForMums
The results will tell you if your baby is at high risk or low risk of chromosomal abnormality in comparison to the general population. The nuchal translucency scan is done between 11 and 14 weeks of pregnancy. Usually the scan is done through your abdomen but occasionally the nuchal translucency can only be seen by inserting a probe into the vagina. You might also be offered a blood test around this time. Your doctor can look at the results of the combined test blood test and nuchal translucency scan to get a more accurate picture of the risk of a chromosomal abnormality.
The results of the nuchal translucency scan will not be used alone to calculate the risk of a chromosomal abnormality. All your first trimester screening is combined to calculate your risk. If your risk is less than 1 in , you are considered low risk.
If it is between 1 in 50 and 1 in you are considered intermediate risk.
Nuchal scan
If it is greater than 1 in 50 you are considered high risk. You may be referred to a genetic counsellor. They will discuss your options and help you to decide if you would like to have a more invasive diagnostic test, such as chorionic villus sampling CVS or amniocentesis. These diagnostic tests can tell you definitively if your baby has a chromosomal abnormality or not.
Tests such as CVS and amniocentesis carry a small risk of miscarriage. You might choose to have a nuchal translucency scan or you may choose to go straight to one of the more invasive diagnostic tests instead to get a definitive answer. You can have chorionic villus sampling from 11 weeks of pregnancy, or you can have an amniocentesis from 15 weeks of pregnancy.
You can also call Pregnancy, Birth and Baby on to talk about these tests and what the results could mean for you and your pregnancy. Information on pregnancy ultrasound scans including when they are taken, what it can be used for, dating scans, anomaly scans, plus links to trusted resources.
- What does a nuchal translucency scan look for?!
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Information on routine antenatal screening tests during pregnancy including weight and height, blood tests, infections, pap test, plus links to trusted resources. A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Learn more about how the procedure is performed. In the second trimester of pregnancy, you may be offered to have an morphology scan anomaly scan.
Learn about what it looks for and when it is performed. Down syndrome is a chromosomal disorder affecting 1 in 1, babies. Screening and diagnostic tests for Down syndrome are offered to women during pregnancy.
Why would I have a dating scan?
Handy infographic that shows what you can expect at each antenatal appointment during your pregnancy. During your pregnancy, you will be offered a number of tests and scans.
The aim is always to check on the health of you and your baby, but it can sometimes be overwhelming and confusing. In the meantime, we will continue to update and add content to Pregnancy, Birth and Baby to meet your information needs. This information is for your general information and use only and is not intended to be used as medical advice and should not be used to diagnose, treat, cure or prevent any medical condition, nor should it be used for therapeutic purposes.
How is a dating scan performed?
The information is not a substitute for independent professional advice and should not be used as an alternative to professional health care. If you have a particular medical problem, please consult a healthcare professional. Scans at this stage in pregnancy are reassuring for women experiencing bleeding, pain or who have had previous miscarriages. Transvaginal scanning may also be used to obtain a better image of the womb.
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- What is a nuchal translucency scan?.
This is a scan which is usually carried out at weeks and is a method of screening for chromosomal abnormalities without having an invasive test such as an amniocentesis. Gestational age is usually determined by the date of the woman's last menstrual period - assuming ovulation occurred on day fourteen of the menstrual cycle. Ultrasound scans offer an alternative method of estimating gestational age. The most accurate measurement for dating is the crown-rump length of the fetus, which can be done between 7 and 13 weeks of gestation. After 13 weeks gestation, the fetal age may be estimated by the diameter of the head and the length of the femur.
week pregnancy dating scan: what will it tell me? | MadeForMums
Dating is more accurate when done early in the pregnancy. When a later scan gives a different estimate of gestational age, the estimated age is not normally changed but rather it is assumed the fetus is not growing at the expected rate. This scan is a routine scan in the UK which takes place at around 20 weeks. This is one of the best times to have an ultrasound done as most infants are the same size at this stage of development. Measurements of the fetus will also be taken to ensure it is growing normally. At this point, should you wish to know the sex of your baby, you can ask the sonographer to tell you.
This scan is the most significant one undertaken during pregnancy, because it can reassure the parents that everything appears to be as it should be. If a potential problem is indicated, a further follow up scan may be needed. If this does occur, the possible complications of or implications for the pregnancy will be fully discussed with the parents by a doctor or consultant and advice and guidance will be provided.
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