Question: Do Doctors Use Gestational Age Or Fetal Age?

What is the difference between gestational age and conceptional age?

Terminology.

Gestational age (GA) refers to the length of pregnancy after the first day of the last menstrual period (LMP) and is usually expressed in weeks and days.

This is also known as menstrual age.

Conceptional age (CA) is the true fetal age and refers to the length of pregnancy from the time of conception..

Should I go by my LMP or ultrasound?

Because few women know the exact day they ovulated or conceived, an ultrasound done in the first trimester of pregnancy has been shown to the be the most accurate way to date a pregnancy. If an ultrasound date in the first trimester differs from your LMP date by seven days or more, we would go with the ultrasound.

Can an ultrasound be wrong about how far along I am?

Evidence suggests that ultrasounds more accurately predict your due date than using your last menstrual period—but only in the first trimester and early second trimester (until roughly 20 weeks). 3 Early ultrasound due dates have a margin of error of roughly 1.2 weeks.

Why does my baby have a big belly in ultrasound?

Intestinal atresia is often detected by ultrasound during the second or third trimester. The fetal stomach will be abnormally shaped or enlarged. There can also be an excess of amniotic fluid in the womb. Too much amniotic fluid in the uterus is known as polyhydramnios and can cause preterm labor.

Would birth weight be a better indicator than gestational age?

We also demonstrate that birth weight is more reliably measured than is gestational age. FFGC were significantly influenced by taller maternal stature, better nutritional stores indexed by maternal arm fat and muscle area during pregnancy, higher birth order, avoidance of smoking and maternal age 20-35 years.

Do doctors go by gestational age or fetal age?

Gestational age vs fetal age While gestational age is measured from the first day of your last menstrual period, fetal age is calculated from the date of conception. This is during ovulation, which means that fetal age is about two weeks behind gestational age. This is the actual age of the fetus.

What is my gestational age for my fetus?

Pregnancy dating – establishing gestational age of a fetus Human gestation is estimated to take 266 days from conception date or 280 days from the last period. Naegele’s indirect rule for EDD advises to add 7 days to the first day of LMP and subtract 3 months to get the EDD.

Can ultrasound give wrong gestational age?

As pregnancy progresses, the accuracy of an ultrasound for predicting due dates decreases. Between 18 and 28 weeks of gestation, the margin of error increases to plus or minus two weeks. After 28 weeks, the ultrasound may be off by three weeks or more in predicting a due date.

Are ultrasounds accurate for baby weight?

Ultrasound exams are notoriously inaccurate for predicting the weight of your baby. The ultrasound gives an estimate of the weight of your baby, but this estimate can be off a pound or more in either direction. There are multiple ways to predict the weight via ultrasound, and the results can vary widely.

Why are 2 weeks added to conception date?

That was the moment of conception. By the time most women miss a period and find out they’re pregnant, the baby has been growing for 2 weeks, but the mother is actually 4 weeks along because the gestational period starts with the first day of your last period.

Can my gestational age be wrong?

After the infant is born, there are a variety of characteristics that can be used to estimate the gestational age. It is possible for gestational age to be inaccurate by up to 2 weeks, even with an accurate LMP date confirmed by other tests. This information does not replace the advice of a doctor.

Does ultrasound show gestational age or fetal age?

First-trimester ultrasound (ultrasound before 13 weeks and 6/7 days) is the most accurate method to establish or confirm gestation age in pregnancy[1]. First-trimester ultrasound can be performed either trans-vaginally or trans-abdominally. Crown-rump length is used for pregnancy dating the first trimester[1].

Do ultrasounds add 2 weeks to fetal age?

Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well. Even average babies can differ by up to 2 to 3 “weeks of growth”;. These scans are only used to estimate the due date of your baby if this is all you have to go on.

What if fetal age is more than gestational age?

Large for gestational age (LGA) is used to describe newborn babies who weigh more than usual for the number of weeks of pregnancy. Babies may be called large for gestational age if they weigh more than 9 in 10 babies (90th percentile) or more than 97 of 100 babies (97th percentile) of the same gestational age.

What is corrected gestational age used for?

Corrected age (weeks or months): chronological age reduced by the number of weeks born before 40 weeks of gestation; the term should be used only for children up to 3 years of age who were born preterm.

Are you automatically 2 weeks pregnant at conception?

The development of pregnancy is counted from the first day of the woman’s last normal menstrual period (LMP), even though the development of the fetus does not begin until conception, which is about two weeks later.