Abstract
The objective was to compare the relative accuracy of clinical versus sonographic estimate of birthweight among post-term pregnancies (gestational age ≥41 weeks). Prospectively over a 2-year period, 84 parturients, with reliable dating criteria, underwent clinical and sonographic estimate (abdominal circumference and femur length) of birthweight. All examinations were performed during the intrapartum period in the labor and delivery suite by one of three obstetricians managing the patient. Among post-term pregnancies, the clinical estimate of birthweight had a significantly lower mean absolute error (322 ± 263 g) and mean absolute percentage error (8.9% ± 7.1%) than sonographic mensuration (547 ± 426 g, 14.8% ± 11.0%, respectively; P < 0.001). Moreover, in post-term pregnancies, clinical estimate was within ±10% of the actual birthweight (65.4%) significantly more frequently than with sonographic (42.8%) mensuration (P = 0.005). Among 20 post-term macrosomic newborns (birthweight ≥4,000 g) clinical estima...
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