CIA Pelvimetry Score: Reproducibility of a New Method for Simplified Clinical Pelvimetry [ID 1263]

INTRODUCTION: Classic clinical pelvimetry to assess the adequacy of the pelvis for vaginal birth is an important skill that has been lost to many obstetrical care providers. This study examines the interprovider reproducibility of a novel, simplified method for clinical pelvimetry. METHODS: In this prospective cohort study, providers conducted the coccyx, ischial spines, and pubic arch (CIA) pelvimetry scoring during routine cervical examinations on study participants. Patient informed consent was obtained. The CIA score was assessed for each participant, with 1 being distant, 3 being prominent, and 2 being not 1 or 3. A cumulative score ranging from 3 to 9 was determined for each participant. Participants included pregnant people undergoing induction of labor at term. The CIA scores were collected from multiple providers on each participant to determine the interprovider reproducibility of the system. A score within 2 points was considered “concordant.” RESULTS: One hundred thirty-nine participants were included in the study, and 36 of these had examinations by more than one provider. Eight of 36 (22.2%) had equal CIA scores; 12/36 (33.3%) had a 1-point CIA score difference; 13/36 (36.1%) had a 2-point CIA score difference; 3/36 (8.3%) had a greater than 2-point CIA score difference. Overall, 91.7% of the examinations by different providers were within 2 points. CONCLUSIONS/IMPLICATIONS: The CIA pelvimetry score is a novel means of assessing the pelvis that is easy to perform and offers acceptable interprovider reproducibility. Further studies are needed to establish its value as a clinical tool.