week pregnancy dating scan - NHS
Ive just got my appoinment for my 12 weeks scan, next thursday! I was just wondering if any one had the nuchal testing when they had theres?. The nuchal translucency measurement can be taken during the dating scan. If you have agreed to have screening for Down's syndrome, the dating scan and the. Dating scan. The dating and/or nuchal translucency scan is the first routine scan. This first routine scan is carried out for the following reasons: to confirm when.
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.
Your week pregnancy dating scan | Bounty
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.
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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.
The results of a nuchal translucency scan may tell you if your baby has a high or low risk of a chromosomal abnormality. Examples of chromosomal abnormalities include trisomy 21 Down Syndrometrisomy 18 Edwards Syndrome or trisomy 13 Patau syndrome. What does a nuchal translucency scan look for? The results will tell you if your baby is at high risk or low risk of chromosomal abnormality in comparison to the general population.
How is a nuchal translucency scan performed and when? 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.
What happens if my baby is in the high risk category?
Your pregnancy and baby guide
The results of the nuchal translucency scan will not be used alone to calculate the risk of a chromosomal abnormality. This leaves the measurement of nuchal transparency as a potentially useful first trimester screening tool. Abnormal findings allow for early careful evaluation of chromosomes and possible structural defects on a targeted basis.
How to define a normal or abnormal nuchal translucency measurement can be difficult. The use of a single millimeter cutoff such as 2. Thus for even greater accuracy of predicting risks, the outcome of the nuchal scan may be combined with the results of simultaneous maternal blood tests.
In pregnancies affected by Down syndrome there is a tendency for the levels of human chorionic gonadotropin hCG to be increased and pregnancy-associated plasma protein A PAPP-A to be decreased. The advantage of nuchal scanning over the previous use of just biochemical blood profiling is mainly the reduction in false positive rates.