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How accurate are first trimester ultrasounds

A 18-year-old female asked:
Dr. Kristi Angevine
15 years experience Obstetrics and Gynecology
Very accurate.: Hi!, great question! Vaginal ultrasounds performed at those times are typically very good at visualizing a few things: -The location of a pregnancy. ... Read More
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Dr. Patrick Connor
35 years experience Emergency Medicine
Accurate: They are accurate depending on technique / skill of the tech and the expertise of the radiologist. But they can off by up 1 week.
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Dr. James Rochester
26 years experience Family Medicine
Pretty Accurate: +/- about 3-4 days if done properly by skilled/experienced operator. With the dates you list, they would be within the error of measurement and sugg ... Read More
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A 25-year-old female asked:
Dr. Bryan Kurtz
A Verified Doctor answered
A US doctor answered Learn more
Very accurate: For establishing gestation age, first trimester ultrasound is accurate to within 4-5 days. Later ultrasounds are less accurate for dating. Sperm can l ... Read More
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A 24-year-old female asked:
Dr. Brian Nguyen
11 years experience Obstetrics and Gynecology
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 h ... Read More
A 29-year-old female asked:
Dr. Robert Andrews
36 years experience Interventional Radiology
First : First trimester ultrasounds are accurate to within a few days. They are more accurate than an estimate based on your last period, especially if you ar ... Read More
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A 39-year-old member asked:
Dr. Geoffrey Rutledge
41 years experience Internal Medicine
The : The earlier an ultrasound is performed during pregnancy the more accurate it is likely to be. Here's a general rule of thumb: a due date given during ... Read More
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A 26-year-old female asked:
Dr. Jane Van Dis
18 years experience Obstetrics and Gynecology
Very accurate: 1st trimester ultrasounds are the most accurate ultrasounds for dating a pregnancy. At 3.1cm today, your 10 weeks along and a due date of 5/14 is wit ... Read More
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A 26-year-old female asked:
Dr. Robert Killian
28 years experience General Practice
Early Ultrasounds: The early ultrasounds are considered the most accurate.
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A 23-year-old female asked:
Dr. Robert Killian
28 years experience General Practice
Early Ultrasounds: The early ultrasounds are always thought to be the most accurate. So, yes. Of course.
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A member asked:
Dr. Claudette Anderson
Specializes in Gynecology
Unlikely: This early more likely accurate
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A 23-year-old male asked:
Dr. Nikolaos Zacharias
26 years experience Maternal-Fetal Medicine
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). ... Read More
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3 thanks

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