A member asked:

How can a ultrasound show the difference in size from 5 weeks pregnant to six weeks?

4 doctors weighed in across 2 answers
Dr. Ron Eaker answered

Difficult: It is hard to make a distinction that small given the margin of error of the machine. Thye measurements are always given as a range.

Answered 2/19/2013

5.3k views

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Sac measurement: Size of the sac holding the embryo is measured in 3 dimensions, averaged, and compared to a chart that gives the age of the embryo.

Answered 3/20/2013

5.2k views

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