The accuracy of gestational age prediction in 30 growth-retarded fetuses as derived from the fetal femur length (FL) was compared with that derived from the . Abdominal circumference was a significantly more accurate predictor of fetal length (r = 0.732) compared with femur length (r = 0.712), biparietal diameter (r = 0.644), and head circumference (r = 0.661; P <.05), although each of these biometric indices explained only about 50% of the variance in fetal length (R2 = 0.423–0.548). Predicted menstrual age values in weeks for specific femur length measurements in millimeters were calculated and are reported in tabular form. The variability (+/- 2 SD) associated with predicting menstrual age from femur length is +/- 9.5 days between 12--23 weeks, but between 23--40 weeks the variability is +/- 22 days.Fetal foot length is a reliable parameter for use in the assessment of gestational age and is particularly useful when other parameters do not accurately predict gestational age, for example, hydrocephalus, anencephaly, short limb dysplasia.
Does femur length in utero predict height?
Predicted adult height was correlated both with FL in the second and third trimester, while present height of the child was correlated with FL only at the third trimester. Conclusions: FL showed a close relationship with postnatal measurements.
What does femur length determine?
Fetal femur length (FL) is one of the basic biometric parameters used to assess fetal size. Femur length together with biparietal diameter, head circumference, and abdominal circumference are computed to produce an estimate of fetal weight.
How do you calculate fetal length from femur?
Femur length can be used to calculate fetal length, another predictor of fetal growth, with the following equation 3: Fetal length in centimeters = 6.18 + 0.59 x femur length in millimeters.1Femur length.2Femur diaphysis length.3Femoral lengths.4Femoral length.5Femur length (FL)Femur length (obstetric ultrasound) | Radiology Reference Article
How accurate is femur length in ultrasound?
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.
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.
How do you determine fetal length?
The simplest way to gauge a baby’s size in utero is to measure an expecting mom’s fundal height. Fundal height measures the distance from your pubic bone to the top of your uterus in centimeters. Your health care practitioner will also palpate your abdomen to get an idea of your baby’s size.
What is the most commonly used measure of fetal growth?
Ultrasound biometry of the fetus is now the gold standard for assessing fetal growth (Figure 2). The measurements most commonly used are the biparietal diameter, head circumference, abdominal circumference and femur length.
What does the fetal femur length measure?
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. (Chart and further comments) Similar to the BPD, dating using the FL should be done as early as is feasible. Abdominal circumference (AC)
Can we predict menstrual age from femur length?
Predicted menstrual age values in weeks for specific femur length measurements in millimeters were calculated and are reported in tabular form. The variability (+/- 2 SD) associated with predicting menstrual age from femur length is +/- 9.5 days between 12–23 weeks, but between 23–40 weeks the variability is +/- 22 days.
Is it normal for a baby to have a short femur length?
It can be frightening to hear that your baby has a short femur length, or another marker of concern. However, in most cases, the outcome is still a healthy, full-term baby.
Why is fetal foot length important in the assessment of gestational age?
Fetal foot length is a reliable parameter for use in the assessment of gestational age and is particularly useful when other parameters do not accurately predict gestational age, for example, hydrocephalus, anencephaly, short limb dysplasia. MeSH terms Female