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How accurate are pregnancy scans

A 46-year-old female asked:
Dr. Robert Kwok
Pediatrics 33 years experience
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
Dr. Gurmukh Singh
Pathology 49 years experience
Agree with Dr. K: If you have any doubt, get a blood test for HCG level. In case it is borderline a serum FSH level would be useful to rule out menopause as the cause o... Read More

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A 22-year-old female asked:
Dr. James Ferguson
Pediatrics 46 years experience
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
Dr. Andrew Doe
Interventional Radiology 20 years experience
Earlier the better: Ultrasound becomes less accurate as the pregnancy progresses.
A 45-year-old member asked:
Dr. Joseph Accurso
Radiology 29 years experience
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
A 24-year-old female asked:
Dr. Pavel Conovalciuc
Family Medicine 23 years experience
The earlier the bett: Although, earlier scans appear to be more accurate, the difference between 6 and 12 weeks should not be striking.
A 23-year-old female asked:
Dr. Shari Jackson
Radiology 21 years experience
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
A 23-year-old female asked:
Dr. Robert Kwok
Pediatrics 33 years experience
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 24-year-old female asked:
Dr. Liza Kunz
Maternal-Fetal Medicine 21 years experience
Yes, fairly accurate: The margin of error on a dating scan at 13 weeks is approximately 7 days.
A 27-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
A 20-year-old female asked:
Dr. Gurmukh Singh
Pathology 49 years experience
Visit this site for information and talk to your doctor for an ultrasound examination. https://www.pampers.com/en-us/pregnancy/pregnancy-symptoms/arti... Read More
A 43-year-old member asked:
Dr. Bruce J. Stringer
Radiology 47 years experience
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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