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The person doing the test (a doctor or sonographer) puts some gel onto the skin, over the area to be scanned.
The doctor or sonographer then passes a small probe over your skin. The probe looks like a hand-held microphone. It doesn’t hurt, but it may feel a bit uncomfortable if the doctor/sonographer has to press down quite firmly in places.
The gel makes good contact between the probe and the skin, and helps the sound waves to pass more easily through the skin. You may need to change position on the couch during the test, so that pictures can be taken from different angles
When all the pictures have been taken you can wipe off the gel, and the test is over.
It usually takes around 20 minutes to complete.