Product of fetal crown-rump length and trunk area: ultrasound measurement in high-risk pregnancies.
Calculation of the product of crown-rump length and trunk area (CRL x TA), as measured by ultrasound between 34 and 36 weeks and combined with accurate assessment of gestational age in early pregnancy, was previously shown to be highly effective in detecting the small-for-dates fetus in a largely unselected series of patients. To assess the value of this two-stage schedule in high-risk pregnancies, 202 patients with singleton pregnancies at risk of fetal growth retardation were studied. Of the 53 babies that were small-for-dates at birth, 49 (92%) were identified in advance by CRL x TA measurement. In contrast to previous findings, measurement of trunk area (TA) alone was similarly effective, identifying in advance 48 (91%) of these small-for-dates babies.
D000886:Anthropometry; D005260:Female; D005317:Fetal Growth Retardation / Q000175:diagnosis*; D005333:Fetus / Q000033:anatomy & histology*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011296:Prenatal Diagnosis / Q000379:methods*; D011446:Prospective Studies; D014463:Ultrasonography