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At 5-8 weeks a bradycardia (less than 90 bpm) is associated with a high risk of miscarriage.

Since its introduction in the late 1950s ultrasonography has become a very useful diagnostic tool in Obstetrics.

Currently used equipments are known as real-time scanners, with which a continous picture of the moving fetus can be depicted on a monitor screen.

Very high frequency sound waves of between 3.5 to 7.0 megahertz (i.e.

A full bladder is often required for the procedure when abdominal scanning is done in early pregnency.

There may be some discomfort from pressure on the full bladder.