From assumptions to outcomes: How unconscious bias shapes obstetric care.

Unconscious bias influences clinical judgment and communication across healthcare, but its effects in obstetric practice are particularly consequential due to time-sensitive decision making, high emotional vulnerability, and longstanding maternal health inequities. When bias-driven interactions escalate into coercion, non-consented procedures, or normalized mistreatment, they constitute forms of gender-based violence embedded within routine clinical care. This review synthesizes evidence on how unconscious bias shapes provider-patient communication, shared decision making, autonomy, and obstetric outcomes. A systematic review with narrative synthesis was conducted using PubMed Central and Google Scholar from inception to August 2025. English-language studies examining unconscious or implicit bias in obstetric communication or decision making were eligible. Dual screening, structured data extraction, and thematic synthesis were performed. A total of 89 studies met inclusion criteria, including qualitative, quantitative, mixed-methods, and conceptual designs. Across settings, unconscious bias manifested through: (1) Dismissal of symptoms and credibility discounting; (2) selective or incomplete information exchange; (3) stereotyping and moral judgment; (4) differential clinical discretion, surveillance, and escalation; and (5) normalized mistreatment and non-consented care. These mechanisms systematically undermined communication quality, restricted shared decision making, and reduced autonomy, particularly for Black, Indigenous, migrant, low-income, uninsured, adolescent, and disabled patients. Quantitative and vignette studies demonstrated measurable effects on clinical decisions, including biased cesarean recommendations, disparities in pain management, and delays in recognizing deterioration. These processes contributed to documented inequities in severe maternal morbidity, intervention rates, and maternal near-miss events. Notably, coercive consent practices, non-consented procedures, and normalized disrespect emerged as manifestations of gender-based violence within obstetric settings. Unconscious bias shapes obstetric interactions through interconnected communication and decision making pathways that constrain autonomy, reduce quality of care, and reinforce structural inequities. At its most severe, bias-driven care constitutes a form of gender-based violence that disproportionately affects racialised and socially marginalized women. Effective mitigation requires multi-level strategies combining communication-focused interventions, standardized protocols, interpreter support, reflective practice, and institutional accountability frameworks.