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Understanding Early Pregnancy / First Trimester Ultrasound Results

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Updated July 14, 2014

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Why Doctors Order Ultrasound in Early Pregnancy
Early Pregnancy

In early pregnancy, the ultrasound is attempting to get an image of a very small gestational sac.

Image © A.D.A.M.

Researchers have mapped out the expected measurements for specific points in early pregnancy, so an early ultrasound scan can give a doctor some important information.

A common use of ultrasound in early pregnancy is to calculate a gestational age. For this purpose, an ultrasound is considered a highly accurate means of dating a pregnancy. In a normal pregnancy, the ultrasound results can provide an estimate of the gestational age to within five to seven days of accuracy.

When a woman is having miscarriage symptoms, a doctor may order one or more ultrasounds to determine the viability of the pregnancy.

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