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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.
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.
Fetal heart rate tends to vary with gestational age in the very early parts of pregnancy.
Normal heart rate at 6 weeks is around 90-110 beats per minute (bpm) and at 9 weeks is 140-170 bpm.