What is an ultrasound scan?

What is an ultrasound scan?

An ultrasound scan sends sound waves through your womb (uterus). These waves bounce off your baby as echoes. 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. These appear white in the image, and soft tissues appear grey. Fluids, such as the amniotic fluid surrounding your baby, appear black. This is because the sound waves go through them with no echoes.

The person performing the scan (sonographer) will look at these different shades to interpret the images.

Your first scan can be very exciting because it gives you a first glimpse of your baby. Your sonographer may even print out the image of your baby and give it to you as a keepsake. However, you will need to ask at the start of your scan, and your hospital may charge for this service.

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