Doctor insights on:
First Trimester Ultrasound
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 moreSee 1 more doctor answer
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
Early Ultrasounds: Actually they are thought to be the most accurate. ...Read more
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
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
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
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
How accurate are second and third trimester sonogram measurements in figuring date of conception?
Early Ultrasounds: The early ultrasounds are considered the most accurate. ...Read more
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
Within 3 days usu.: 6 days maximumGet a more detailed answer ›
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
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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