Nt dating scan

Your pregnancy and baby guide

There are a number of tests and scans available to you during your pregnancy. The nuchal translucency scan is an ultrasound that may detect the risk of a number of chromosomal abnormalities. A nuchal translucency scan is part of the ultrasound scan that most pregnant women have at around 12 weeks of pregnancy. The results of a nuchal translucency scan may tell you if your baby has a high or low risk of a chromosomal abnormality.


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Examples of chromosomal abnormalities include trisomy 21 Down Syndrome , trisomy 18 Edwards Syndrome or trisomy 13 Patau syndrome. 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. 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.

Pregnancy symptoms How to conceive a girl hCG levels chart Implantation bleeding. I didnt get dating scan or NT scan, i just had a normal ultrasound at 12 wks and with all my other ultrasound the dates have only been a day apart! I have no idea which is more accurate but the scans are only an estimate. I had a dating scan which put me at 12 weeks. I then had a scan at 19 weeks which put me 20 weeks and 2 days. I have had another scan which going by my dating scan i should of been 25 weeks 5 days and it put me at 28 weeks. The scan dates are only a guide and it is considered that you are full term 2 weeks either side of the dates they give you.

Plumbum New Zealand Total posts: Dating scans are most accurate between 6 and 8 weeks, after that genetics plays a factor in the size of the baby. This was told to me by several medical professionals. I two dating scans with DD2, the first one said 5 weeks 3 days and cos there was no heartbeat and the embryo was just so small and hard to measure we went back two weeks later and the second one dating us at 7 weeks 6 days not 7 weeks 3 days.

DD2 was born 3 days early, so I reckon that scan was pretty accurate.

Anyways, the point of what I'm saying is neither of your scan after 12 weeks are going to be as accurate as a early one. Perhaps go with the later date 12 weeks 5 days and then if bubs is late you will not feel you have been as pregnant for as long IYKWIM. The ultrasound tech needs access to your lower abdomen, so make sure you wear comfortable clothing that makes it accessible.

Results from the scan may be available on the same day of testing, and your doctor may discuss the findings with you before you leave. This test isn't perfect.

NT Scan: What You’ll Find Out

In other words, 5 percent of women tested receive positive results, but the baby is fine. After a positive result, your doctor may suggest another blood test called prenatal cell-free DNA screening. This test examines fetal DNA in your bloodstream to assess your baby's risk for Down syndrome and other chromosome abnormalities.

It can be frightening to receive inconclusive or positive results from an NT scan. It doesn't offer a definitive answer about chromosomal abnormalities.

When is an NT scan scheduled during pregnancy?

An NT scan is a screening test, not a diagnostic test. There are differences between screening and diagnostic testing. The purpose of a screening test is to identify risk factors for a particular disease or condition.


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  5. Diagnostic testing, on the other hand, confirms the presence of a disease or condition. To diagnosis a chromosome abnormality, ask your doctor about diagnostic testing.

    Options include an amniocentesis, which is when a needle is inserted through your stomach into the amniotic sac to retrieve a fluid sample. Amniotic fluid contains cells that provide genetic information about your baby. Another option is chorionic villus sampling. A sample of your placental tissue is removed and tested for chromosome abnormalities and genetic problems. Talk to your doctor if you experience anxiety, or are worried about how the results might affect you. There are a lot of do's and don'ts that come along with pregnancy.

    Learn which ones you should follow for a healthy pregnancy and baby. During pregnancy, soaking in a hot tub may sound like a great way to relieve aches and pains. Unfortunately, it's risky for your baby-to-be. In your third trimester and having some shooting pain "down there"? In general, lightning crotch pain is a normal part of pregnancy and nothing to get….