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Obstetric dating accuracy

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. It won't hurt, although you may feel a little pressure on your tummy.

Ultrasound scans are considered to be safe for you and your baby when performed by trained professionals.

The dating scan isn't designed to look for more subtle abnormalities, though.

That will happen at your next routine scan at about 20 weeks However, some major problems can be seen at your dating scan, such as issues with the umbilical cord or with your baby's skull or abdominal wall.

Hormones in your blood vary according to your stage of pregnancy.

A blood test at what you thought was 13 weeks wouldn't be helpful if you were actually 16 weeks pregnant.


  1. Therefore, measurements taken later on, when babies begin to grow at different rates among pregnancies, yield increasingly inaccurate dating of pregnancy. Although the dating of pregnancy accuracy takes a dive, still ultrasound is indispensable for the other uses. In early pregnancy, the measurement from the top of the.

  2. The first trimester is defined as the first 13 weeks of pregnancy following the last normal menstrual period some authors refer to early pregnancy as 0-10 weeks. It can be divided into a number of phases, each of which has typical clinical issu.

  3. Jun 13, 2017. Joseph Woo, M. D. explains in "Obstetric Ultrasound A Comprehensive Guide". Seeing the gestational sac, which looks like a black dot in the uterus, has several benefits it confirms that a woman is pregnant, confirms that the pregnancy at a very early stage, making dating the pregnancy very accurate.

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