Ultrasound scan of pregnant woman. A doctor holds an ultrasound scanner on the abdomen of a pregnant woman. A monitor shows an ultrasound image of her baby. Ultrasound scanning uses high-frequency sound waves to detect body tissues of different density, to diagnose disease, and to examine moving particles like blood. It is often performed about 16-18 weeks into pregnancy, where it can detect certain disorders and helps establish fetal size, and hence expected delivery date. The technique is painless and safe.
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