How accurate is an ultrasound for the age of a fetus?
If the radiologist is competant enough, ultrasound can be 99% accurate.
Can your last menstrual period show twenty three weeks but your ultrasound show twenty seven weeks which is more accurate?
If an ultrasound gives you a date of how far along you are is it possible you could have been pregnant 5 weeks ago and still had your period and the ultrasound be off?
The ultrasound doesnt give you the date. It is estimated by the days you give to the doctors to help, narrow down the date. The first day of your last period and how long you've missed help them in determining your conception date. The picture shows them an image of a fetus and they use that picture to say at what developmental stage the baby is in. Anything is possible. Answer Contrary to the opinion…