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Ultrasound in pregnancy. Woman in late pregnancy in an ultrasound suite during the monitoring of her unborn baby. The sonographer (at left) holds a hand-held transducer which is moved over the woman's lubricated abdomen to detect the foetus in the womb. A two-dimensional image of the developing foetus is seen on the screen. Ultra- sound scanning is a diagnostic technique that uses high-frequency sound waves. In pregnancy it is performed to detect foetal disorders, and it helps establish foetal size and healthy development and hence the expected delivery date. The technique is painless and harmless.
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