BACKGROUND: Countries with resource-poor health systems have struggled to improve access to and the quality of caesarean section (C-section
CS) for women seeking care in public health facilities. Access to C-section in Bihar State remains very low, while access has increased in many other contexts. METHODS: We used quality improvement (QI) combined with targeted resource management to test and implement changes that were designed to increase C-section delivery. We compared C-section delivery percentages after the interventions across eight intervened (QI) hospitals and between QI hospitals and the remaining 22 non-intervened (non-QI) hospitals with baseline CS <
10%. We linked patterns of improvement and sustainability to theoretical drivers of improvement and timing of interventions. RESULTS: In QI hospitals, C-section percentage increased from 2.9% at baseline to 5.9% in the intervention phase and 4.6% in the post intervention phase. In non-QI hospitals, we observed a small change (2.6-3.3%) during the same time period of the interventions in the QI hospitals. Addition of skilled personnel resulted in increased C-section percentage in QI hospitals (3.6-5.9%) but not non-QI hospitals (3.4-3.2%). CONCLUSIONS: C-section availability increased for a population of women giving birth following initiation of QI BTS collaborative in a low-income country public sector setting that has historically struggled to provide this service. Addition of obstetric and operating room resources alone, without interventions to support system changes, may not result in additional increase in C-section delivery. The adaptive implementation model may contribute to efforts to provide more access to C-sections in other very resource-limited settings.