Skip to the last paragraph for my question if the second paragraph is too long! calculate the length of a pregnancy by gestational age. If pregnancy was achieved using assisted reproductive technology, gestational age is calculated by adding 2 weeks to the conceptional age. Calculating the day your baby begins to develop and keeping track of your pregnancy dates can be a challenge. 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 … Why to Know these Ages? Gestational Age = Fetal age + 2 weeks; Fetal Age = Gestational age-2 weeks. Pregnancy is also divided into trimesters which last about 12 – 14 weeks each. Most references to pregnancy are usually in gestational age rather than fetal age development. Gestational Age 37 to 38 weeks ( 8.5 to 8.7 months). Fetal age is the actual age of the growing baby. 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. Chronological age (days, weeks, months, or years): time elapsed from birth. So typically, fetal age is going to be two weeks less than gestational age. It’s easy to get confused between fetal age and gestational age, but here’s the big difference. Gestational age is the age of the pregnancy from the last normal menstrual period (LMP). The fetal age is another term that refers to the actual age of the baby starting at the time of conception. Such methods include adding 14 days to a known duration since fertilization (as is possible in in vitro fertilization), or by obstetric ultrasonography. The reason healthcare providers do it that way is that it’s important to have concrete dates to determine when certain tests are done during the pregnancy. Gestational age (completed weeks): time elapsed between the first day of the last menstrual period and the day of delivery. Thus, a full-term pregnancy would be 40 weeks long. Fetal age and Gestational age. Fetal development varies in different trimesters and therefore gestational age and fetal age should be related to the growth of the fetus. Hoping this community can help share some thoughts or similar experiences before I give the clinic a call. Gestational age vs Fetal age. I may have to say goodbye, but I'm feeling confused. Fetal Age 35 to 36 weeks : The fetus is now considered to be early term. Confused about gestational age vs fetal age at US. 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 should match the height of the fundus and this is confirmed by ultrasound. Content Warning. 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