I understand that in US PhD programs, students are often labelled as a "PhD Student" until they pass their qualification exams and begin working on their dissertations, at which point they can be called "PhD Candidate".
What is the convention for Oxford DPhils and other European PhDs, given that there is no coursework? At Oxford, students are admitted as a Probationer Research Student and must pass 2 milestones, the Transfer of Status and Confirmation of Status. At which point, or after which exam that is passed, can one refer to themselves as a DPhil Candidate?
I'd like to know to avoid misrepresentation of my background as there are certain opportunities and/or visa and residential statuses reserved for those who have completed all requirements but their dissertation (ie. PhD Candidates).