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Doctor insights on: First Trimester Ultrasound

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How accurate are first trimester ultrasoubds?

How accurate are first trimester ultrasoubds?

Very accurate: Ultrasounds tend to get more inaccurate as your pregnancy progresses. First trimester ultrasounds are more accurate than second trimester ultrasounds, which are in turn more accurate than third trimester ultrasounds. First trimester ultrasounds can reliably predict gestational age within 5-7 days. ...Read more

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Dr. Michael Gabor
2,271 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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Are first trimester ultrasounds better at estimating conception or lmp?

Are first trimester ultrasounds better at estimating conception or lmp?

Better than later: A pregnancy dating ultrasound done at 8 to 11 weeks of pregnancy is pretty accurate when done by an experienced technician. The estimate can be a few days or a week off in either direction. ...Read more

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Are first trimester ultrasounds ever exact in dating?

Are first trimester ultrasounds ever exact in dating?

Early Ultrasounds: Actually they are thought to be the most accurate. ...Read more

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How accurate are first trimester ultrasounds done abdominal?

How accurate are first trimester ultrasounds done abdominal?

Diagnostics: This question is hard to answer because it depends upon what you're looking for with your first trimester ultrasound. If you're trying to figure out how far along you are in the pregnancy that is excellent, if you're trying to figure out if your baby has down syndrome it's not perfect and will require further work up with other blood tests and ultrasounds. ...Read more

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How is conception date calculated by first trimester ultrasound?

How is conception date calculated by first trimester ultrasound?

Measurements: US uses measurements of the gestational sac and then the growing fetus to date a pregnancy. The appearance of the heart beat. Usually measurements are compared to standards for various parts of the pregnancy and a date assigned. ...Read more

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Third trimester pregnancy questions?

Third trimester pregnancy questions?

What are they?: Do you mean what questions should you be asking when you are in your 3rd trimester? I.E. What should you expect during this time period? How is the body changing? When to epxect contractions? What r signs/symptoms of labor? Should you change diet/activities? Can u still have relations? What medicine u can/cannot take if ill? There r many more. I am not sure if u mean such as these. Good luck. ...Read more

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How often are first trimester ultrasounds off in dating conception?

Off?: Depends what you mean by 'off.' the theoretical accuracy of a 1st trimester us is considered to be +/- 2-3 days, so in that sense they are always 'off.' if you mean wrong, as in more than 2-3 days, no one knows this - but with a skilled sonographer and a current us machine, it shouldn't be off by more than a few days very often. ...Read more

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How accurate are 1st trimester ultrasounds in estimating gestational age? What about 2nd trimester ultrasounds?

How accurate are 1st trimester ultrasounds in estimating gestational age? What about 2nd trimester ultrasounds?

Accurate!: 1st trimester ultrasounds are very accurate - have correlated with timed ivf pregnancies. We usually consider 1st trimester scans accurate within 5-7days' 2nd trimester scans within 10-14days. ...Read more

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How accurate are ultrasound in the first trimester?

How accurate are ultrasound in the first trimester?

Early Ultrasounds: The early ultrasounds are considered the most accurate. ...Read more

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What changes a due date? And why is the first trimester ultrasound more accurate than the second trimester ultrasound?

What changes a due date? And why is the first trimester ultrasound more accurate than the second trimester ultrasound?

Ultrasound dating.: First trimester ultrasound is by far the most accurate in determining the precise due date (+/- 3-7 days, depending on exactly when it is performed). Second trimester sonograms are less accurate but still helpful in pegging down the due date within +/-7-12 days. Third trimester scans are not very accurate in dating the pregnancy, as growth varies (+/- 14-21 days). Menstrual dating is not very good. ...Read more

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Typhoid treatment in first trimester pregnancy?

Typhoid treatment in first trimester pregnancy?

Antibiotics...: ... Usually used to treat typhoid are not recommended in pregnancy, but there are safe alternatives, such a ceftriaxone. ...Read more

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What weeks are first trimester?

What weeks are first trimester?

Through 13th week: The first trimester of pregnancy is up through the 13th week. The second trimester begins with the 14th week, and the third trimester begins with the 27th week. ...Read more

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Cramps during second trimester of pregancy?

Cramps during second trimester of pregancy?

See your doctor: Symptoms like these have to be evaluated in real-time by your physician. He/she has access to your examination, laboratrory data and many other diagnostic tests to get to the bottom of what's going on and offer you help. ...Read more

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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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Pineapple for first trimester of pregnancy?

Food ; pregnancy: There is no restriction with pineapple and pregnancy. ...Read more