Accurate early ultrasounds dating pregnancy
Transvaginal ultrasound can see embryonic development about a week before transabdominal ultrasound, the American Pregnancy Association (APA) states.
A transducer, a wand-shaped probe, is inserted into the vagina and pressed against the vaginal walls directly next to the uterus.
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.
A blood test is the most accurate test for pregnancy.
Ultrasounds measure the size of the fetus to predict a due date and are usually very accurate, within two weeks, so I would safely assume that it would not be off by five weeks.
They could be out as little as a couple of days by a matter of weeks.At 20 weeks they are accurate within 5 days When I had my first pregnancy my cycle was 36 days which would mean my EDD would be 8 days early if my LMP was used, my US agreed…Yes, During an ultra sound they measure the length of the baby, the limbs if visible, head circumference etc.. An ultrasound is accurate to within a couple of days if done at 8 weeks. After this babies grow at such diffeerent rates that it becomes increasingly less accurate.You can ask your doctor, it won't be the first time he or she has answered that question, I promise. U/S before 12 weeks of pregnancy are very accurate, plus or minus 2 weeks…Women have cycles that are not all the same length but most women ovulate 14 days before a period is due. At 7 weeks ultrasounds are accurate to within 3 days.