Bpd dating pregnancy
During the examination, the fetus is seen by abdominal ultrasound.
The fetus is now large enough for an accurate survey of the fetal anatomy.
The Femur length (FL)The femur, or thigh bone, is the white structure located near the top of the image.
Its length is measured from one end to the other [white ].
Different babies of the same weight can have different head size, therefore dating in the later part of pregnancy is generally considered unreliable.
Dating using the BPD should be done as early as is feasible.
The weight of the fetus at any gestation can also be estimated with some accuracy using polynomial equations containing the BPD, FL, and AC.
Similar to the BPD, dating using the FL should be done as early as is feasible.The Crown-rump length (CRL)The length of the embryo on the longest axis constitutes the crown-rump length.This is among the best documented parameters to date the embryo, with accuracy of /- 3 to 5 days.To explain some of those results, a 'Level II' study was performed.A scan is performed at 18 to 20 weeks when the fetus is large enough for an accurate survey of the fetal anatomy, and when dates and growth can also be assessed.