Antepartum evaluation of the obstetric conjugate at transabdominal 2D ultrasound: A feasibility study

Introduction The obstetric conjugate represents the shortest anteroposterior diameter of birth canal and it reflects capacity pelvic inlet to allow passage engagement fetal head. antepartum evaluation this parameter may be attempted at digital examination predict risk cephalopelvic disproportion, but accuracy clinical pelvimetry is notoriously poor. aim our study was describe sonographic measurement transabdominal 2D-ultrasound assess its reproducibility. Material methods This a prospective cohort conducted tertiary University hospital. A non-consecutive series pregnant women with uncomplicated singleton pregnancies attending antenatal clinic for routine booking from 34 weeks gestation onward were included. ultrasound probe longitudinally placed above level symphysis interpubic fibrocartilaginous disk visualized. Then promontory identified as most prominent segment sacral vertebral column. measured distance between inner edge promontory. inter- intraobserver repeatability calculated using intraclass correlation coefficient (ICC) Bland–Altman method. Results In all, 119 considered eligible study; these, 111/119 (93.3%) included in analysis median gestational age 36.0 (35.0–37.0) weeks. mean 11.4 ± 0.93 cm first operator 0.91 second operator. overall interobserver ICC 0.95 (95% [confidence interval] CI 0.92–0.96) 0.97 0.96–0.98). Limits agreement ranged −0.84 0.80 measures −0.64 0.62 measures. degree reliability also analyzed body mass index ≥30 ≥37 ICCs respectively 0.90–0.98) 0.98 (0.95–0.99) former group 0.96 0.93–0.98) 0.95–0.98) latter group. Conclusions Our demonstrated that among term gestation, feasible reproducible.