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A short history of the development of ultrasound in pregnancy can be found in the History pages.
Ultrasound scan is currently considered to be a safe, non-invasive, accurate and cost-effective investigation in the fetus. The gestational sac can be visualized as early as four and a half weeks of gestation and the yolk sac at about five weeks.
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.
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.
There is no sensation at all from the ultrasound waves.In such cases, it is reasonable to repeat the ultrasound scan in 7-10 days to avoid any error.The timing of a positive pregnancy test may also be helpful in this regard to assess the possible dates of conception.It has progressively become an indispensible obstetric tool and plays an important role in the care of every pregnant woman. The embryo can be observed and measured by about five and a half weeks. The viability of the fetus can be documented in the presence of vaginal bleeding in early pregnancy.