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Doctor insights on: First Trimester Ultrasound

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Can a first trimester ultrasound be 19 days off?

Can a first trimester ultrasound be 19 days off?

Not likely: Measurements during the first trimester are usually accurate to +/- 7 days, and are established from the first day of bleeding from your last menstrual cycle . As the pregnancy progresses the dating becomes less accurate. ...Read more

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Dr. Michael Gabor
2,193 doctors shared insights

Sonogram (Definition)

An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. There are no side effects. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body. In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical ...Read more


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Can a first trimester ultrasound be two weeks off?

Can a first trimester ultrasound be two weeks off?

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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First trimester ultrasound off by more than a week?

First trimester ultrasound off by more than a week?

Yes.: Generally, the ultrasound can be off for a about week in the 1st trimester, 2 weeks in the 2nd, and 3 weeks in the 3rd. ...Read more

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Can a first trimester ultrasound be three weeks off ?

Can a first trimester ultrasound be three weeks off ?

No: A late first trimester ultrasound (i.e., 12 weeks) may be off by as much as a week in either direction but unless done by a completely incompetent sonographer, 3 weeks would be unheard of. Earlier in the first trimester the accuracy is even better with a range of less than a week. ...Read more

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Can first trimester ultrasounds be over 7 days off?

Can first trimester ultrasounds be over 7 days off?

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