Top
10
Doctor insights on: Ultrasound To Determine Gestational Age

Share
1

1
Is gestational age accurate from ultrasound at 9 weeks?

Is gestational age accurate from ultrasound at 9 weeks?

Yes it is: By that point, ultrasound is the primary tool to estimate gestational age. More accurate than last menstrual period. ...Read more

Dr. Michael Gabor
2,155 doctors shared insights

Sonogram (Definition)

The sonogram is a test that looks at body organs with no radiation. It uses sound waves and can give us a 2 dimensional view of organs such as the kidney, liver, heart, and lungs. It can define spaces that are either solid or full of fluid. I can also guide large needles into an organ or near the spine, and can help define the area being cut open. Its a ...Read more


2

2
Is a gestational age reading accurate on a 10 week ultrasound? And what exactly are they measuring?

Is a gestational age reading accurate on a 10 week ultrasound? And what exactly are they measuring?

Accurate: A first trimester ultrasound is highly accurate. They are measuring what is called a crown (top of the head) rump (bottom of the bum) length. The length is compared to average size embryos to come up with a gestational age. ...Read more

3

3
Don't ultrasounds start gestational age from your LMP date?

Don't ultrasounds start gestational age from your LMP date?

Yes: All pregnancies are dated from the first day of the last menstrual period but an early ultrasound is more precise and may change the due date if greater than a 5 day difference. Gd luc. ...Read more

4

4
How accurate is gestational age at 13 weeks via ultrasound ?

About 7 days: First trimester ultrasounds are the most accurate, but a 13 week ultrasound should be quite good at estimating the due date. Best of luck! ...Read more

See 1 more doctor answer
5

5
Can measurements taken from an ultrasound lead to a wrong estimation of gestational age?

Can measurements taken from an ultrasound lead to a wrong estimation of gestational age?

Yes: An ultrasound done in the first trimester will be accurate to within a week of the due date. In fact don't think of it as a due date, but more as a due week as 90% of women will have their baby one week around their due date. Ultrasounds in the second and third trimester will be accurate to within 2-3 weeks of the due date. ...Read more

See 1 more doctor answer
7

7
Is conception usually two weeks after gestational age from ultrasound?

Is conception usually two weeks after gestational age from ultrasound?

Yes: That's basically correct, it's close to 2 weeks. Ultrasound dating is calculated as if it's from a 'theoretical' last menstrual period, so actual conception would be around 2 weeks after. ...Read more

8

8
Are ultrasounds a very accurate indicator of gestational age?

Earlier the better: The accuracy of ultrasound diminishes with the age of the fetus. The most accurate dating is in the first 4-6 weeks. ...Read more

10

10
Would the gestational age of 12wks+4days @62mm be off by 1 week since ultrasounds have a margin of error of 1 week in the first trimester?

Estimates: Determination of gestational age is based on estimates determined by the last menstrual period and ultrasound. There is a margin of error with ultrasound, but that does not mean that the gestational age is necessarily different by a week. It means that the ultrasound estimate is 12w4d with a very high likelihood that the actual age is between 11+ to 13+ weeks. ...Read more

See 2 more doctor answers