A member asked:

My first ultrasound showed only a 9mm gest sac. 2 weeks later they could see the baby, measuring 7w1d. how accurate are these measurements for dating?

A doctor has provided 1 answer

Dr. Dean Giannone answered

Pretty standard.: Although there is usually some plus/minus variance in the measurement, these measurements have been established and standardized so they are pretty accurate.

Answered 3/9/2016

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A member asked:

My first ultrasound showed only a 9mm gest sac. 2 weeks later they could see the baby, measuring 7w1d. how accurate are these measurements for dating?

A doctor has provided 1 answer

Dr. Dean Giannone answered

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