Baby dating ultrasound
We recommend that you present your dating scan results to your usual healthcare professional whose contact details we take at the time of booking.
Your choice of a free rescan may be appropriate if we are unable to perform the primary purpose of this scan.
The first is known as the ‘dating scan’ because it helps to show how many weeks pregnant you are, it can also check your baby's development.
Your 12-week ultrasound scan is the 1st of the 2 routine pregnancy scans you're offered on the NHS.Things your ultrasound can show: In the few cases where ultrasound reveals an unexpected problem, you may be referred for further diagnostic tests.National guidelines say that women should be offered at least two scans.You can calculate your due date by subtracting three months from the first day of your last menstrual period (LMP) and then add a week. A pregnancy is based on being 280 days long, which is 40 weeks (more like 10 months not 9! When we give you a due date we consider 37 to 42 weeks to be full-term, so even if your baby is born two weeks before your due date it is not considered premature.The accuracy of using your LMP to date your pregnancy depends on having regular cycles and assumes you ovulated (released an egg) on day 14 of your cycle and conceived right away - none of which may be true.