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The conducting gel is non-staining but may feel slightly cold and wet.There is no sensation at all from the ultrasound waves.Repetitive arrays of ultrasound beams scan the fetus in thin slices and are reflected back onto the same transducer.The information obtained from different reflections are recomposed back into a picture on the monitor screen (a sonogram, or ultrasonogram).
For example, if ultrasound scan demonstrates a 7mm embryo but cannot demonstrable a clearcut heartbeat, a missed abortion may be diagnosed.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.A positive pregnancy test 3 weeks previously for example, would indicate a gestational age of at least 7 weeks.Such information would be useful against the interpretation of the scans. In the presence of first trimester bleeding, ultrasonography is also indispensible in the early diagnosis of ectopic pregnancies and molar pregnancies. Determination of gestational age and assessment of fetal size.