If pregnancy was achieved using assisted reproductive technology, gestational age is calculated by adding 2 weeks to the conceptional age. Gestational age should match the height of the fundus and this is confirmed by ultrasound. Fetal age and Gestational age. Thus, a full-term pregnancy would be 40 weeks long. Gestational age (completed weeks): time elapsed between the first day of the last menstrual period and the day of delivery. 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. Fetal age is the actual age of the growing baby. Such methods include adding 14 days to a known duration since fertilization (as is possible in in vitro fertilization), or by obstetric ultrasonography. Why to Know these Ages? The fetal age is another term that refers to the actual age of the baby starting at the time of conception. Gestational age is the number of weeks that have passed since the first day of a woman's last normal menstrual period. Hoping this community can help share some thoughts or similar experiences before I give the clinic a call. Gestational Age = Fetal age + 2 weeks; Fetal Age = Gestational age-2 weeks. Gestational age vs Fetal age. Confused about gestational age vs fetal age at US. 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 the age of the pregnancy from the last normal menstrual period (LMP). 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. Chronological age (days, weeks, months, or years): time elapsed from birth. Fetal development varies in different trimesters and therefore gestational age and fetal age should be related to the growth of the fetus. Content Warning. 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. So typically, fetal age is going to be two weeks less than gestational age. calculate the length of a pregnancy by gestational age. Pregnancy is also divided into trimesters which last about 12 – 14 weeks each. 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. I may have to say goodbye, but I'm feeling confused. 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