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Canadian Obstetric Survey System (CanOSS)

The Canadian Obstetric Survey System (CanOSS) is aimed at reducing severe adverse pregnancy events in Canada, through a phased approach. The system will collect prospective data at regional-, provincial- and national levels, to improve the quality of maternal care.Website: https://canoss.ca/

Mission statement

To provide clinical, systemic, and contextual evidence needed to strengthen pregnancy and post-pregnancy maternal health outcomes in Canada.

Aims and scope

  • To examine clinical, social, and structural factors to be addressed to reduce severe adverse pregnancy events in the future.
  • To bring together diverse voices and foster an environment for continuous learning promoting a just and safe culture.
  • To ensure that insights gathered create system-wide improvements with a focus on equity-informed approaches.

Current studies

  • CanOSS-Hamilton: A pilot project aimed at understanding reasons behind high rates of peripartum complications in individuals with a prior caesarean birth in the Hamilton region (Southern Ontario).
  • CanOSS-Ontario: A province-wide initiative aimed at exploring and addressing the clinical, socio-cultural and contextual factors responsible for severe peripartum haemorrhage in Ontario.
  • CanOSS-Cardiovascular: A research study involving cardio-obstetrics centres across Canada, aimed at understanding factors contributing to severe morbidity and mortality from cardiovascular conditions during and after pregnancy

Funding organizations are acknowledged as follows:

Canadian Institutes for Health Research (CIHR)Hamilton Academic Health Sciences Organization (HAHSO)Juravinski Research Institute (JRI)

The Heart and Stroke Foundation and Brain Canada

Updated: Wednesday, 30 July 2025 16:23 (v2)