Pregnancy due date based on ultrasound dating

It may also help you to avoid feeling disappointed towards the end of your pregnancy if you think your baby is late when he's not.

Of all of these uses, dating the pregnancy is the most common reason to use ultrasound, particularly when the expectant mother cannot remember the date of her last period (as in breast-feeding or irregular cycles).Measuring the baby using ultrasound is most accurate in early pregnancy. The best time to estimate gestational age using ultrasound is between the 8th and 18th weeks of pregnancy.The most accurate way to determine gestational age is using the first day of the woman’s last menstrual period and confirming this gestational age with the measurement from an ultrasound exam.Gestational age, or the age of the baby, is calculated from the first day of the mother’s last menstrual period.Since the exact date of conception is almost never known, the first day of the last menstrual period is used to measure how old the baby is.

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