An ultrasound scan can be used for various kinds of diagnosis as stated below:
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Check that the baby is developing normally
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Determine the baby's age and expected delivery date
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Check the position of the baby and the placenta, for example, before amniocentesis, or later in pregnancy to make sure the placenta is not blocking the neck of the womb.
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Detect some abnormalities, such as problems with the brain and spine
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Find out whether you are carrying more than one baby
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