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3.5 to 7 million cycles per second) are generally used for this purpose.
They are emitted from a transducer which is placed in contact with the maternal abdomen, and is moved to "look at" (likened to a light shined from a torch) any particular content of the uterus.
Movements such as fetal heart beat and malformations in the feus can be assessed and measurements can be made accurately on the images displayed on the screen.
Ultrasound can also very importantly confirm the site of the pregnancy is within the cavity of the uterus. A visible heartbeat could be seen and detectable by pulsed doppler ultrasound by about 6 weeks and is usually clearly depictable by 7 weeks.At 5-8 weeks a bradycardia (less than 90 bpm) is associated with a high risk of miscarriage.Many women do not ovulate at around day 14, so findings after a single scan should always be interpreted with caution.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.