Doctor insights on:
First Trimester Ultrasound
How accurate are first trimester ultrasounds at 8w1d & 9w5d done 2 weeks apart? And how much can it be off by?
Fetal Ultrasound: A first trimester ultrasound is pretty accurate in terms of predicting expected date of delivery. Having two within 2 weeks with these fetal ages tends to indicate the accuracy of the measurements, and indicates that the fetus is growing. If the 2 ultrasounds were 14 days apart, the difference in the estimated age was 11 days, that gives a very accurate prediction of a due date, within 3 days. ...Read moreSee 2 more doctor answers
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
8%: The margin of error is calculated by 8% of the number of days pregnant. At 8w1d that is .08x 57 days or 4.56 days and at 9w5d it is 0.08x68days or 5.44 days. ...Read more
Early Ultrasound: Nope. These are thought to be the most accurate. ...Read more
Possible: Usually not in the first weeks-4 to 6, but as the time of gestation progresses the estimation of gestational age can change. ...Read more
All of my early ultrasounds agree with each other but my 20 week ultrasound was off by three days vs. first trimester ultrasound normal?
Yes,: that is within the normal margin of error. ...Read more
Should be within: 4-6 days at the most and often times within 1 or 2 days. ...Read more
It can show discord: A first trimester ultrasound is extremely accurate in determining how far along you are, and when the exact due date is. It is possible for it to show that the pregnancy is 2 weeks 'off' from what the expected due date was. As long as it was done by a qualified sono technician or physician, it's unlike for it to be 2 weeks inaccurate in the first trimester. You may have ovulated earlier (or late. ...Read more
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