British undergraduate degree classification
In the United Kingdom, medicine is usually taught as an undergraduate course, with graduates being awarded a master's level qualification: normally the conjoined degrees of Bachelor of Medicine, Bachelor of Surgery (MBBS, BM BCh, MB ChB, etc.) although at Queen's University Belfast (and universities in Ireland) Bachelor in the Art of Obstetrics (BAO) is added, and at some universities only the Bachelor of Medicine is awarded - all of these have equal standing. Unlike most undergraduate degrees, the MBBS is not normally considered an honours degree, and thus is not classified into first class honours, etc. Students may be awarded "Merits" and "Distinctions" for parts of the course or the whole course (depending on the institution) and "Honours" may be awarded at some institutions for exceptional performance throughout the course (as a grade above Distinction).
Propaedeutics
In the US, the equivalent of the propaedeutic diploma lies somewhere between an undergraduate certificate and an associate degree. Undergraduate certificates can be completed in as little as one semester (one-half of one academic year or about four months) and do not necessarily lead or contribute to any degree. Associate degrees (e.g. AA, AS) are typically earned after the first two years of the four- to five-year (in the US) course of study culminating in a baccalaureate degree; however, students matriculated in a bachelor's degree program are not usually awarded the associate degree en route (as is often the case when a doctoral student is awarded a master's degree en route). Additionally, there are first professional associate degrees (e.g. AAS, AGS) that do not necessarily lead or contribute to a bachelor's.