What happens at a dating scan? The scan is usually done through your tummy, though sometimes a vaginal scan will offer a better view. If the scan date differs from your period dates, the scan date will be used. You'll have a dating scan, also known as a week scan between about 10 weeks and 14 weeks of pregnancy. The point of the scan is to work out how many weeks pregnant you are. First trimester combined screening As long as your baby measures between 45mm and 84mm, you'll be offered combined screening at the same time as your dating scan. The dating scan usually takes about 20 minutes NHS a. The sonographer will put some gel on your tummy and move a small hand-held device transducer over your skin to get views of your baby NHS b. It's also an opportunity to check how your baby is growing. This will date your pregnancy. This is called the combined screening test.
If you're found to be fewer than 11 weeks pregnant at your dating scan, or your baby measures less than 45mm, you'll be able to rebook your combined screening. You may have calculated the length of your pregnancy from the first day of your last menstrual period LMP. Your dating scan is offered between about eight weeks and 14 weeks. Therefore, from 13 weeks, or if your baby is longer than 84mm, the circumference of the head becomes the best way to measure your baby NICE , Mongelli However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days Mongelli If you feel a bit apprehensive about a vaginal scan, you may feel less worried if you: This will date your pregnancy. The sonographer will put some gel on your tummy and move a small hand-held device transducer over your skin to get views of your baby NHS b. By then, the sonographer will be able to see your baby in more detail because he's bigger. This estimates the chance of your baby having Down's syndrome. Combined screening checks how your baby is developing. Rest assured it is safe for your baby. Early scan An early scan is offered from six weeks, so before your dating scan. The transducer will be covered with a plastic or latex sheath and will be well lubricated with gel. How accurate are dating scans? Hormones in your blood vary according to your stage of pregnancy. What will you do with your scan photos? It's also an opportunity to check how your baby is growing. Your baby's head, limbs, hands, and feet can be seen, as well as his abdominal wall and some organs, such as his stomach. It may show a very minor problem, or something that may get better on its own. When will I have my dating scan? That's because screening needs to be carried out between 11 weeks and 14 weeks of pregnancy. Most units offer a screening test for Down's syndrome and other conditions at the same time as the dating scan. Your sonographer may ask to carry out a vaginal scan rather than one via your tummy. You can have the combined screening test from 11 weeks to 13 weeks plus six days, or when your baby's CRL is 45mm 1.
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