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