Researchers found that pregnancies in which the fetus had a short femur length
also were more likely to result in delivery before 34 weeks' gestation (OR, 4.
Previous reports examined a more distal femur site (4% of femur length
, the femoral condyles) and noted severe decline in trabecular BMD.
2] exposure with femur length
in the second and third trimester persisted (results not shown).
With regard to CsOV, the highest variation was observed for the PsOG derived using femur length
for Raters I and III and for the bi-parietal diameter for Rater II (Tables 1, 2 and 3).
Other factors that independently predicted a statistically significant 4%-17% increased risk for shoulder dystocia at term included estimated fetal weight, femur length
, abdominal circumference, and the ratio of femur length
to biparietal diameter, reported Dr.
The three markers found to have the most predictive value were short femur length
, the presence of structural anomalies such as a heart defect, and nuchal fold thickening.
Unfortunately, taking abdominal circumference has more interobserver and intraobserver variation than either femur length
or biparietal diameter," Dr.
The ultrasound algorithms included fetal measurements of biparietal diameter, head circumference, abdominal circumference, and femur length
in various combinations.
Findings that didn't fall into either category but were associated with an increased risk of aneuploidy included intrauterine growth restriction, short humeri, and an abnormal femur length
to abdominal circumference ratio.
Generally, physicians use a formula combining abdominal circumference with biparietal measurements or femur length
to estimate fetal weight, but near term as the baby's head gets deep in the pelvis, sonography may not show the fetal head clearly enough to measure biparietal diameter.
They compared measures of biparietal diameter, head circumference, abdominal circumference, and femur length
with published data on mean growth rates in singletons.
were then taken from all individuals and used as a measure of body size.