The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days. Learn more about how and when it is performed. You may be asked to drink some water and not go to the toilet beforehand because a full bladder helps to push your womb up to give a better picture. The best or should that be worst. A sonographer, who is usually a radiographer or a midwife trained in ultrasound, will complete your scan. You may also like to ask your friends who have had a positive experience and to see who they would recommend in terms of having firsthand experience.
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Screening for Down's syndrome will happen at the dating scan if:.
Your pregnancy and baby guide
The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date. Didn't get the email? If this is your first ultrasound you will be understandably anxious. A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. But by the time the baby has developed to full term, this rate increases to around BPM. So obtaining accurate measurements and visualising them clearly on the screen is a little easier than when they are able to do somersaults and move around a lot. The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.