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ultrasound due date

A 38-year-old member asked:
Dr. Douglas Bourgon
21 years experience Radiology
Best on earlier u/s: Ultrasounds use composite data obtained during the exam to determine an EDD (estimated date of delivery). This date will also have a +/- number of da ... Read More

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A 27-year-old female asked:
Dr. Boniface Ikejiani
26 years experience Obstetrics and Gynecology
Due date estimation: The estimation of due date can be based on lmp or ultrasound. If the ultrasound due date was performed in the first trimester and the difference is m ... Read More
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A 30-year-old male asked:
Dr. Ted Anderson
27 years experience Gynecology
Accuracy varies: The accuracy of ultrasound varies depending on when in pregnancy it is done. Generally +/- 1 week in first trimester, +/- 2 weeks in second trimester ... Read More
A 36-year-old female asked:
Dr. Joseph Accurso
28 years experience Radiology
Within 4 days is : No real difference. There is nothing magical about either date, except for 2 things: 1. If the LMP is different from the early OB us dating by mor ... Read More
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A 31-year-old female asked:
Dr. Shari Jackson
20 years experience Radiology
Calculator: Using a reverse due date calculator, you can enter the estimated due date and the calculator will determine the likely date of conception based on ave ... Read More
A 31-year-old female asked:
Dr. Jeff Livingston
21 years experience Obstetrics and Gynecology
Sept 23 : If that is the correct due date then you got pregnant around sept 23.
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A 31-year-old female asked:
Dr. Shari Jackson
20 years experience Radiology
Depends: Your OB will decide based on certainty of your clinical dates. Not sure how you know when you ovulated. Due date is usually determined based on lmp, ... Read More
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A 30-year-old female asked:
Dr. Mary David
Specializes in Obstetrics and Gynecology
Depends: It depends on when ur ultrasound was done whether it or ur dates r more accurate.The margin of error for ultrasound dating increases as the pregnancy ... Read More
A 28-year-old female asked:
Dr. Yvette Westford
19 years experience Obstetrics and Gynecology
Yes: The margin of error in Ob ultrasound is 1 week in 1st trimester, 2 weeks in 2nd and 3 weeks in 3rd trimester. With an 8 week difference in coital timi ... Read More
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A 35-year-old female asked:
Dr. Ralph Boling
38 years experience Obstetrics and Gynecology
Ultrasound date CRL: ultrasound date from crown rump length (CRL), will be best way to assign due date, gestational sac, not as good

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