Conceptual dating using ultrasonically measured fetal femur length and abdominal diameters in early pregnancy.
The association between fetal anthropometric measurements and conceptual age was determined for the femur length and the mean of two abdominal diameters for conceptual ages between 10 and 20 completed weeks. The conceptual age used for reference was determined by the fetal crown-rump length measured at an earlier examination. Two equations are presented for the calculation of conceptual age from isolated estimations of the femur length or the mean of two abdominal diameters. Mean abdominal diameter and femur length measurement values were found to have similar precisions of dating.
D000005:Abdomen / Q000033:anatomy & histology / Q000196:embryology; D000886:Anthropometry / Q000379:methods; D005260:Female; D005269:Femur / Q000033:anatomy & histology / Q000196:embryology; D005333:Fetus / Q000033:anatomy & histology*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D014463:Ultrasonography