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how accurate are pregnancy scans

A 54-year-old female asked:
Dr. Robert Kwok
32 years experience in Pediatrics
Urine test is better: Testing one's urine is so simple and so accurate that there is no reason to bother with an online survey. An online test cannot give a definite answer ... Read More
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A 30-year-old female asked:
Dr. James Ferguson
45 years experience in Pediatrics
Depends: The precision of an ultrasound depends somewhat on the equipment, the technician, the interpreter & the reason for study. If the scan is done to verif ... Read More
A 52-year-old member asked:
Dr. Joseph Accurso
28 years experience in Radiology
LMP dating vs US: Both methods have some error. Us dating is most accurate between 8 and 13 weeks using the crown rump length of the fetus. If us and LMP dating are ... Read More
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A 30-year-old female asked:
Dr. Pavel Conovalciuc
22 years experience in Family Medicine
The earlier the bett: Although, earlier scans appear to be more accurate, the difference between 6 and 12 weeks should not be striking.
A 31-year-old female asked:
Dr. Shari Jackson
20 years experience in Radiology
US is enough: An early dating scan in the first trimester of pregnancy is quite accurate for determining how far along someone is in her pregnancy. It is especiall ... Read More
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A 31-year-old female asked:
Dr. Robert Kwok
32 years experience in Pediatrics
Should be ok: Dating ultrasound scans have good accuracy at 8-11 weeks, so one done at 13 weeks should still be reliable. Dates by ultrasound are always estimates.
A 31-year-old female asked:
Dr. Liza Kunz
Dr. Liza Kunz answered
20 years experience in Maternal-Fetal Medicine
Yes, fairly accurate: The margin of error on a dating scan at 13 weeks is approximately 7 days.
A 31-year-old female asked:
Dr. Charles Gordon
Specializes in Adolescent Medicine
3 day difference: All tests have error bands. You report a three day difference in two methods of estimating your fetus' gestational age. The key word in that sentence ... Read More
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A 29-year-old female asked:
Dr. Ralph Boling
38 years experience in Obstetrics and Gynecology
And your question: Is?
A 50-year-old member asked:
Dr. Bruce J. Stringer
46 years experience in Radiology
Around 5 weeks: Very early changes may be seen by 5 weeks but fetal heart activity will reliably be seen by 7 weeks (on transvaginal scans).

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