Seliger G, et al. - The effects of different ultrasound measurement methods (linear vs curved array) and measuring conditions [impact of pressure by fetal head/pelvis on the lower uterine segment (LUS)] during LUS-muscular-thickness measurement were established. In addition, researchers introduced the intraoperative ultrasound measurement of LUS-muscular thickness (reference measurement method), and evaluated the correlation between different combinations of LUS-muscular-thickness measurement ultrasound techniques at birth planning and preoperative vs intraoperative measurements. This prospective clinical observational study of 33 women (ultrasound measurements: n=601) with the previous cesarean delivery displayed no systematic difference between LUS-muscular-thickness measurements with linear vs curved array but between measurements with pressure by the fetus vs without. They noted that as long as the measurements were made without pressure from the fetal head/pelvis on the LUS, the highest correlation coefficients were detected for the preoperative (at the day of cesarean section), transabdominal–vaginal approach combined ultrasound measurements vs the intraoperative ultrasound measurements of LUS-muscular thickness—. Findings thus suggest an improvement in the performance of LUS thickness measurement by ultrasound near term with the systematic application of predetermined measuring conditions, standardized setup criteria.