Accuracy of pregnancy dating ultrasound
This is to check that your baby is developing normally. Most of the time, the placenta has moved into a better position by the time you're 32 weeks pregnant. An ultrasound scan sends sound waves through your womb (uterus). The echoes are then turned into an image on a screen that shows your baby’s position and movements.Hard tissues, such as bone, reflect the most sound waves and so make the biggest echoes.A first-trimester scan will check that your baby's heart is beating and also look at the basic anatomy of your baby’s head, abdominal wall, and limbs.
In your second trimester you'll be offered an anomaly scan between 18 weeks and 21 weeks. Your first scan is more likely to be a dating scan when you're between about 10 weeks and 14 weeks pregnant. This will confirm your due date and check whether you are having twins. Hypertension in pregnancy: diagnosis and management. A full bladder helps the ultrasound echoes to reach your womb, giving the sonographer a good view of your baby. Because the content you submit in the interactive parts of our site will be available to all our users and may be available to the general public, please do not provide personal or confidential information. If your baby's still deep in your pelvis, or if you're overweight, the image won't be very clear.