Pregnancy dating scan accuracy

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Screening for Down's syndrome will happen at the dating scan if: The screening test for Down's syndrome used at this stage of pregnancy is called the combined test.The combined test involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.

Early ultrasounds are more accurate than later ultrasounds.But earlier u/s is more accurate than later at 6-8w they are fairly accurate but it does depend on the skill of the operator and if there is anything unusual about your uterus it can effect measurements (tilted or retroverted uterus for example).My 9 week scan gave me an EDD of a weeks difference as opposed to my LMP. The bright white circle center-right is the head, which faces to the left.Features include the forehead at 10 o'clock, the left ear toward the center at 7 o'clock and the right hand covering the eyes at .Every pregnant woman wants to know her due date, and a due date that is calculated from her last menstrual period often doesn't match the due date that is estimated by her first ultrasound (also known as a sonogram).

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