A member asked:

Is a 9 week or 20 week ultrasound more accurate for dating a pregnancy?

2 doctors weighed in across 2 answers
Dr. Felicia Tillman answered

Specializes in Obstetrics and Gynecology

9wk: Early in the pregnancy the baby grows at a certain known rate. The 9wk sonogram is by far more accurate for dating.

Answered 8/12/2015

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9 week: As a rule, earlier ultrasounds provide more accurate dating for pregnancies.

Answered 3/4/2014

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Related Questions

A member asked:

Are ultrasounds accurate at dating conception at 12 weeks?

3 doctors weighed in across 2 answers