Gestational Age Calculator

To compare the accuracy of the reported date of the last menstrual period LMP with that of symphysis-fundal height SFH in the estimation of gestational age GA , using an ultrasound US scan as reference. Gestational age was concurrently assessed by the 3 methods in this prospective, population-based, pregnancy-outcome study conducted in Hyderabad, Pakistan, from June 18, , through August 31, , with women between 20 and 26 weeks of a singleton pregnancy.

Knowing gestational age GA accurately is essential for optimal prenatal, delivery, and postnatal care. The expected date of delivery, correct diagnosis of preterm or post-term labor, and differentiation between premature birth and intrauterine growth restriction rest on the estimated GA, as do prenatal counseling and interventions for poor fetal growth as well as the avoidance of unnecessary hospitalization, testing, and interventions such as induction of labor and tocolytic treatment .

Furthermore, a close estimation of GA informs research toward improving maternal and neonatal outcomes.

Once the estimated due date (EDD) is established, it should rarely be changed, as the determination of gestational age is.

Gestation is defined as the time between conception and birth. A fetus grows and develops in the womb during gestation. The gestation period is how long a woman is pregnant. Most babies are born between 38 and 42 weeks of gestation. Babies born before 37 weeks are considered premature. Babies born after 42 weeks are called postmature.

Where your baby is in their development — such as whether their fingers and toes have formed — is tied to gestational age. Gestational age is measured in weeks from the first day of your last menstrual period. This means that your last period counts as part of your pregnancy. Your doctor can also determine gestational age using an ultrasound or after delivery. After birth, gestational age is determined using the Ballard Scale, which assesses the physical maturity of your baby.

Gestational age is divided into two periods : embryonic and fetal.