Preparation for a dating ultrasound
If you are overweight or your body tissue is dense, sometimes this can reduce the quality of the image because there is more tissue for the ultrasound waves to get through before they reach the baby.
If it's difficult to get a good image, the scan may take longer or have to be repeated at another time.
Ultrasound scans use sound waves to build a picture of the baby in the womb.
Having the scan does not hurt, but the sonographer may need to apply slight pressure on your tummy to get the best views of the baby. However, the sonographer may not be able to get good views if your baby is lying in an awkward position or moving around a lot.
Most scans are carried out by specially trained staff called sonographers.
The scan is carried out in a dimly lit room so the sonographer is able to get good images of your baby. You'll then be asked to lower your skirt or trousers to your hips and raise your top to your chest.
Talk to your midwife, GP or obstetrician about any concerns you have.
For many women, ultrasound scans are the highlight of pregnancy.
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The sonographer estimates when your baby is due (the estimated date of delivery, or EDD) based on the baby's measurements.