Chronological age (days, weeks, months, or years): time elapsed from birth. I may have to say goodbye, but I'm feeling confused. Content Warning. Fetal age is the actual age of the growing baby. The fetal age is another term that refers to the actual age of the baby starting at the time of conception. So typically, fetal age is going to be two weeks less than gestational age. Gestational Age = Fetal age + 2 weeks; Fetal Age = Gestational age-2 weeks. It’s easy to get confused between fetal age and gestational age, but here’s the big difference. Skip to the last paragraph for my question if the second paragraph is too long! Hoping this community can help share some thoughts or similar experiences before I give the clinic a call. Gestational age is the age of the pregnancy from the last normal menstrual period (LMP). Gestational age vs Fetal age. Why to Know these Ages? Such methods include adding 14 days to a known duration since fertilization (as is possible in in vitro fertilization), or by obstetric ultrasonography. If pregnancy was achieved using assisted reproductive technology, gestational age is calculated by adding 2 weeks to the conceptional age. Gestational age (completed weeks): time elapsed between the first day of the last menstrual period and the day of delivery. calculate the length of a pregnancy by gestational age. Gestational age assessment by ultrasonography in the first part of the second trimester (between 14 0/7 weeks and 21 6/7 weeks of gestation, inclusive) is based on a composite of fetal biometric measurements and has an accuracy of 7–10 days 19 20 21 22. Calculating the day your baby begins to develop and keeping track of your pregnancy dates can be a challenge. Fetal age and Gestational age. The average 37 week fetus is 19.1 inches ( 48.9 cm) long and weighs 6.7 pounds (3028 grams) The average 38 week fetus is 19.5 … Gestational age is basically the age of your pregnancy starting from your LMP, whereas fetal age is the actual age of the growing fetus or baby inside you, and is calculated from the date of conception. Gestational age is a measure of the age of a pregnancy which is taken from the beginning of the woman's last menstrual period (LMP), or the corresponding age of the gestation as estimated by a more accurate method if available. Most references to pregnancy are usually in gestational age rather than fetal age development. Thus, a full-term pregnancy would be 40 weeks long. So if the gestational age is 8 weeks then fetal age is 6 weeks. Gestational age should match the height of the fundus and this is confirmed by ultrasound. Gestational Age 37 to 38 weeks ( 8.5 to 8.7 months). 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