Accuracy of Ultrasound ???

[earthlovers123]

How accurate are ultrasound results ?

Suppose in Ultrasould result it says ... baby is 11 weeks old .

When will be the conception date ?

How far off the ultrasould result can go ?

[babyktchr, BSN, RN]

The ultrasound is as good as the operator that is doing the ultrasound. Measurements taken of a fetus determines aging. Sometimes the U/S says a baby is bigger or smaller for gestational age, or right on target.. Are you disputing the results? Did you think the fetus is older/younger than what U/S reported?

[SmilingBluEyes]

also remember, a "normal" gestation is 38-42 weeks. There is room for "fudging" and even with several measurements in the first trimester (most accurate), nothing is fool-proof. 11 weeks is in the "ballpark" of most-accurate gestational dating assessments, but like I said this is far from a perfect science.

[JenTheRN]

From what I understand from our OB docs, the earlier a U/S is done, the more accurate the results are.

[FrumDoula]

From what I understand from our OB docs, the earlier a U/S is done, the more accurate the results are.

That does seem to be what the research suggests as well.

[babyktchr, BSN, RN]

Yup...for purposes of EDC, especially with an unknown LMP, the early sono is DA ONE!!!!

[FrumDoula]

But for the purposes of assessing fetal weight in late pregnancy, you're better off visiting a tarot card reader.