Mathematical modeling of the data has demonstrated that the femur growth curve is non-linear beyond 13 weeks of gestation. With the aid of a scientific calculator the data were analyzed and a simple second grade equation has been derived: GA (weeks) = 0.262(2) FL (cm) + 2 FL + 11.5, S.D. obgyn.onlinelibrary.wiley.comИзображение:obgyn.onlinelibrary.wiley.comFoetal foot length is other method to measure gestational age. Femur length/ Foot Length ratio is nearly constant during pregnancy. Foetal foot length is a trustworthy method for assessment of gestational age and femur length/ foot length ratio is roughly 1 and a ratio of < 0.92 will be used in finding most cases of dysplasias.
Does femur length indicate height in pregnancy?
Parental height was positively associated with fetal head circumference and femur length. The associations with paternal height were detectible earlier in gestation (17–29 weeks) compared to the associations with maternal height.
Does femur length indicate age?
It is well established that ultrasound measurement of femur length and biparietal diameter are comparably accurate estimators of gestational age when obtained in the first half of pregnancy. Both estimators, however, become less accurate later in pregnancy.
What does femur length indicate?
Femur length (FL)
Measures the longest bone in the body and reflects the longitudinal growth of the fetus. Its usefulness is similar to the BPD. It increases from about 1.5 cm at 14 weeks to about 7.8 cm at term.
How accurate is femur length in third trimester?
After 26 weeks, all measurement are less accurate. In the third trimester, the variation in both biparietal diameter and femur measurements is +/- 14 to 24 days.
When is the length of the femur determined during pregnancy?
[Fetal femur length in the 2d and 3d trimester of pregnancy] Results of sonographic determination of the length of femur between the 12th and 42nd week of pregnancy are presented.
Are ultrasound measurements of femur length and biparietal diameter accurate estimators of gestational age?
It is well established that ultrasound measurement of femur length and biparietal diameter are comparably accurate estimators of gestational age when obtained in the first half of pregnancy. Both estimators, however, become less accurate later in pregnancy. The present study compares the relative ac …
What is the normal foetal femoral length at 42 weeks?
The foetal femoral length growth presents a characteristic appearance between the 12th and 42nd pregnancy week. In the 12th pregnancy week it is 11 mm on the average, 33 m in the 20th, 58 mm in the 30th, and 76 mm at birth.
What is normal fetal femur length at 14 weeks?
Femur length increases from about 1.5 cm at 14 weeks to about 7.8 cm at term. ( see chart) Similar to the BPD, dating using the femur length should be done as early as possible. Why are fetal measurements important?