The maternal mortality ratio in the United States is increasing; understanding the significance of this change and developing effective responses requires a granular analysis of the contributing factors that a well-informed maternal mortality review committee can provide. Data collection and analysis, clinical factors, preventability, social determinants of health, and racial inequities combine to affect this outcome, and each factor must be considered individually and in combination to recommend a robust response. Obstetrician-gynecologists formed the State of Michigan's Maternal Mortality Review Committee (the Committee) in 1950 to identify gaps in care that needed to be systematically addressed at the time. In the early years, the Committee witnessed a reduction in the number of maternal deaths; over time, prioritization of maternal mortality decreased, yet the Committee witnessed changing patterns of death, varied data collection and evaluation processes, delayed reviews, and unimplemented recommendations. The calculation of the maternal mortality ratio was not informed by the outcomes of Committee reviews. Today, the Committee, with increased support from the Michigan Department of Health & Human Services, can clearly identify and report preventable pregnancy-related mortality along with its causes and is close to achieving a near real-time surveillance system that allows the development of timely clinical and policy recommendations and interventions. The Committee's adaptations in response to the rise in maternal mortality have resulted in several lessons learned that may be helpful for currently operating committees and in the formation of new ones.
