BackgroundAbnormal uterine bleeding is the direct cause of a significant health care burden for women, their families, and society as a whole. Up to 30% of women will seek medical assistance for this problem during their reproductive years. This guideline replaces previous clinical guidelines on the topic and is aimed to enable health care providers with the tools to provide the latest evidence-based care in the diagnosis and the medical and surgical management of this common problem. ObjectiveTo provide current evidence-based guidelines for the diagnosis and management of abnormal uterine bleeding (AUB) among women of reproductive age. OutcomesOutcomes evaluated include the impact of AUB on quality of life and the results of interventions including medical and surgical management of AUB. MethodsMembers of the guideline committee were selected on the basis of individual expertise to represent a range of practical and academic experience in terms of location in Canada, type of practice, subspecialty expertise, and general gynaecology background. The committee reviewed relevant evidence in the English medical literature including published guidelines. Recommendations were established as consensus statements. The final document was reviewed and approved by the Executive and Council of the SOGC. ResultsThis document provides a summary of up-to-date evidence regarding diagnosis, investigations, and medical and surgical management of AUB. The resulting recommendations may be adapted by individual health care workers when serving women with this condition. ConclusionsAbnormal uterine bleeding is a common and sometimes debilitating condition in women of reproductive age. Standardization of related terminology, a systematic approach to diagnosis and investigation, and a step-wise approach to intervention is necessary. Treatment commencing with medical therapeutic modalities followed by the least invasive surgical modalities achieving results satisfactory to the patient is the ultimate goal of all therapeutic interventions. EvidencePublished literature was retrieved through searches of MEDLINE and the Cochrane Library in March 2011 using appropriate controlled vocabulary (e.g. uterine hemorrhage, menorrhagia) and key words (e.g. menorrhagia, heavy menstrual bleeding, abnormal uterine bleeding). Results were restricted to systematic reviews, randomized control trials/controlled clinical trials, and observational studies written in English and published from January 1999 to March 2011. Searches were updated on a regular basis and incorporated in the guideline to February 2013.Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology-related agencies, clinical practice guideline collections, clinical trial registries, and national and international medical specialty societies. ValuesThe quality of evidence in this document was rated using the criteria described in the Report of the Canadian Task Force on Preventive Health Care (Table). Benefits, harms, and costsImplementation of the guideline recommendations will improve the health and well-being of women with abnormal uterine bleeding, their families, and society. The economic cost of implementing these guidelines in the Canadian health care system was not considered.