RT Journal Article SR Electronic T1 Studying Accompaniment model Feasibility and Effectiveness (SAFE) Study: study protocol for a prospective observational cohort study of the effectiveness of self-managed medication abortion JF BMJ Open JO BMJ Open FD British Medical Journal Publishing Group SP e036800 DO 10.1136/bmjopen-2020-036800 VO 10 IS 11 A1 Heidi Moseson A1 Brianna Keefe-Oates A1 Ruvani T Jayaweera A1 Sofia Filippa A1 Relebohile Motana A1 Chiara Bercu A1 Ijeoma Egwuatu A1 Belen Grosso A1 Ika Ayu Kristianingrum A1 Sybil Nmezi A1 Ruth Zurbriggen A1 Emmeline Friedman A1 Caitlin Gerdts YR 2020 UL http://bmjopen.bmj.com/content/10/11/e036800.abstract AB Introduction A range of barriers deter or prevent people from accessing facility-based abortion care. As a result, people are obtaining and using abortifacient medications to end their pregnancies outside of the formal healthcare system, without clinical supervision. One model of self-managed abortion has come to be known as the ‘accompaniment’ model, in which grassroots organisations provide pregnant people with evidence-based counselling and support through the medication abortion process. Data are needed to understand the safety and effectiveness of this increasingly common model of abortion care.Methods and analysis This is a large, prospective, observational study in Argentina and Nigeria. All people who contact one of two accompaniment groups seeking information for their own self-managed medication abortion, are ages 13 years and older, have no contraindications for medication abortion, are within the gestational range supported by the group (up to 12 weeks’ gestation for the primary outcome) and are willing to be contacted for follow-up will be recruited. Participants will respond to an interviewer-administered baseline survey at enrolment, and 1–4 additional surveys over 6 weeks to ascertain whether they obtain medications for abortion, dosing and route of administration of medications, physical and emotional experience of medication abortion self-management, and effectiveness and safety outcomes. Analyses will include estimates of the primary outcome: the proportion of participants that report a complete abortion without surgical intervention at last recorded follow-up; as well as secondary outcomes including a pseudo-experimental test of non-inferiority of the effectiveness of self-managed medication abortion as compared with clinical medication abortion.Ethics and dissemination We describe the ethical considerations and protections for this study, as well the creation of a study-specific Data Monitoring and Oversight Committee. We describe dissemination plans to ensure that study results are shared widely with all relevant audiences, particularly researchers, advocates, policymakers and clinicians.Trial registration number ISRCTN95769543.