Fetal growth curves for an ethnically diverse military population: the American Institute of Ultrasound in Medicine-accredited platform experience.

Objective: To determine which fetal growth curve provided the best estimates of fetal weight for a cohort of ethnically diverse patients at sea level.

Methods: The study consisted of a population of 1,729 fetuses examined at sea level between January 1, 1997, and June 30, 2000, at 18 weeks, 28 weeks, and term. Gestational age (GA) based on menstrual dates was confirmed or adjusted by crown-rump length or early second-trimester biometry.

Maternal ethnicity and variation of fetal femur length calculations when screening for Down syndrome.

Objective: To determine whether current methods for detecting Down syndrome based on fetal femur length calculations are influenced by ethnicity.

Methods: The study population consisted of all fetuses scanned between 14 and 20 completed weeks' gestation from April 1, 1997, to January 1, 2000. The expected femur length was calculated from the biparietal diameter.