Accurate dating pregnancy ultrasound

Before the advent of routine ultrasound in pregnancy, medical personnel estimated a baby’s due date by the date of the last menstrual period and by feeling the uterus and determining the size to see if it matched the given due date.With transvaginal ultrasound, checking for embryonic development known to occur within a certain time frame more accurately dates a pregnancy.The transvaginal ultrasound provides the most accurate information in early pregnancy, given that the early developing gestational sac and fetal pole are extremely tiny at this point and a vaginal ultrasound can get closer to the developing pregnancy.In a transvaginal ultrasound, the doctor or technician inserts a thin probe into the vagina in order to take a series of measurements, including the size of the gestational sac, the size of the yolk sac, the length of the fetal pole, and the heart rate.I then had a scan at 8 weeks in which they dated a few days closer to the date I had and by my 12 week scan they were spot on what I had predicted!Xx thing is if you have an early scan or blood theres no accurate way of telling how far you are thats why they bring you back aslo to check all is ok. for all 3 of mine all 3 scans ive had, early, 12wk and 20 wks and with my 3rd 28wk private scan all dates have matched my due date so i believe scans are pretty acurate, not for weight of babys though!

Of course, baby didn't come until July 13, so I think my due date had been about the 11th all along!x what i don't understand is how babies measure different CRL yet that is how they measure the EDD on the ultrasound?If one baby is measuring say 67mm and one 76mm, and they date them both at 13w, how does that work??When a woman is having miscarriage symptoms, a doctor may order one or more ultrasounds to determine the viability of the pregnancy.In the first trimester, doctors usually use a transvaginal rather than abdominal ultrasound to gather information about the pregnancy.

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In an abdominal ultrasound, the woman will be asked to come to the scan with a full bladder, because this positions the uterus in a way that makes it easier to obtain measurements.

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