Fetal Long-bone Measurements in the Antepartum Radiographic Prediction of Intra-uterine WeightAid to Prediction of Extra-uterine Survival

摘要

Postpartum measurements were made of the long-bone lengths of 60 infants, using magnified and unmagnified projections, the magnified projections simulating intra-uterine magnification obtained in antepartum films. From the postpartum measurements criterion measurements were established which divided the infants into those who weighed more than 2250 Gm (5 pounds) and those who weighed less. The dividing measurements arecolon; femurmdash;8.6 cm; tibiamdash;7.0 cm; humerusmdash;7.5 cm; ulnamdash;6.8 cm; radiusmdash;5.6 cm. These measurements are used for supine maternal-abdomen roentgenograms obtained at a 1-meter distance, preferably with a small focal spot. Using these measurements and allowing a 100-Gm margin, over 90percnt; accuracy was obtained in predicting, in a series of 100 antepartum examinations, whether the fetus weighed more or less than 2250 Gm.