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A member asked:

How accurate is a dating scan saying im 9 weeks. had 2 a week and a half apart and both said same things. 1st-due date jan 27th other, jan 26th 2016.

A doctor has provided 1 answer
Dr. Michael Gabor answered

Specializes in Diagnostic Radiology

Ultrasound: dating is generally accurate by +/- 8% in days, so at 9 weeks it is accurate to approximately +/- 5 days.

Dr Fowler and another doctor agreed

Answered 10/7/2015

2.2k views

Thank

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