This measurement, known as the crown rump length CRL , is very accurate in the first trimester. Babies have their own clock and can come anywhere from three weeks before this exquisitely determined due date till two weeks after. 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 shouldn't be uncomfortable, and you don't need a full bladder NICE Even average babies can differ by up to 2 to 3 "weeks of growth";. If you prefer, you can have a private screening test. Your sonographer will give you a report of the scan, which will tell you exactly how many weeks pregnant you are. As long as the timings are right, you can have the NT scan and blood test at the same appointment as your dating scan. If your womb uterus is very deep in your pelvis, or if you're overweight , you may be offered a vaginal scan, which can get a closer view of your baby. It may lead to you being given a high chance for Down's syndrome, when your baby is actually developing normally false-positive result NICE
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