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By measuring specific parts of the fetus, it is possible to determine its gestational age and/or the weight of the baby, and this way also the date of the term or the expected birth weight.
The most common measurements that we use at Lille Liv are:

Crown-Rump Length (CRL):
The length of the fetus from the pate to its tailbone. This measurement is done between 8-13 weeks of pregnancy and gives an estimation of the gestational age and therefore an expected date of the term.

Biparietal diameter (BPD):
The diameter of the head, which is measured after 14+

Head Circumference (HC):
The circumference of the head, which is measured after 14+

Femur Length (FL):
The length of the femur, which is measured after 14+

Abdominal Circumference (AC):
The circumference of the stomach which is measured after 14+

Last Menstruation Period (LMP):
The date of the first day of your last period. This is used to calculate the gestational age at the start of the pregnancy.

Gestational Age (GA):
Gestational age is the actual age of the fetus, for humans, it is calculated from the first day of the last normal period. Even though ovulation is not until about 14 days later.

EDD is Expected Date of Delivery and is the expected date of the term.