Antenatal Screening for Down's syndrome, setting standards to improve women's health. This estimates the risk of Down syndrome and other chromosomal abnormalities. However, most of these babies will turn out not to have Down syndrome. However, the timing of your first scan will also depend on how your pregnancy is going, and where you live. If you do know the conception date, this is counted as day 14, and not day one. The scan can check that your baby has a heartbeat and is developing normally. However, some major problems can be seen at your dating scan, such as problems with your abdominal wall or with your baby's skull. Some hospitals and private clinics offer a dating and screening scan at the same time. The dating scan will take between five minutes and 10 minutes. This measurement, known as the crown rump length CRL , is very accurate in the first trimester. Consent standards and guidance for Down's syndrome and Fetal Anomaly screening.
It's worth knowing that there's no evidence that scans are unsafe for you or your baby. The sonographer will put some gel on your tummy and will move a small hand-held device a transducer over your skin to get views of your baby. This estimates the risk of Down syndrome and other chromosomal abnormalities. Keep it with your maternity notes so your midwife and anyone else involved in your care can see it. Finding out about having twins early in pregnancy also gives you more time to prepare for the birth and for your doctor or midwife to plan your care. Knowing about twins early is also useful if you want to have screening for Down syndrome. This is because blood tests for Down syndrome are not very accurate if you are having more than one baby. Dating and growth in the first trimester. Your midwife may recommend an early scan at between six weeks and 10 weeks if you have experienced bleeding. You may also be offered an early scan if you've had a previous miscarriage. However, most of these babies will turn out not to have Down syndrome. Instead, you will be offered a nuchal translucency NT scan. For most mums-to-be, the first scan will be a dating scan at between 10 weeks and 13 weeks plus six days of pregnancy NICE The rhetoric of "natural" in natural childbirth: National Institute for Health and Clinical Excellence, clinical guideline If you have an irregular cycle, or if you've recently been taking the contraceptive pill , working out the date from your LMP isn't a very accurate method. What else will the dating scan reveal? She may be able to refer you. The scan's main purpose is to work out accurately how many weeks pregnant you are and estimate your due date. You could have a dating scan, without NT screening, or even change your mind on the day of your scan. What happens during the dating scan? Royal College of Obstetricians and Gynaecologists. When will I have my first scan? Your baby is measured from head to bottom. Your baby's head, limbs, hands and feet, and some organs can be seen.
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