Obstetric ultrasonography is the most important development in obstetrics since the introduction of antibiotics.
Before ultrasound scans the practitioner's hands and tape measure were the only ways to assess the size and position of the fetus.
Clinical examination is inaccurate whereas ultrasound is both safe and accurate.
It is now possible to examine the fetus for a range defects such as cleft lip, skeletal dysplasias, major cardiac and renal and gut lesions.
NICE have issued guidance concerning timing of routine ultrasound scans during pregnancy (1,2)
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