Outside Hospital stands for which abbreviation?

• A. R/O
• B. Pt
• C. OSH
• D. PMHx

Answer: (C)

Knowing common abbreviations for the source of information in a patient's chart helps you quickly understand where the data originated. OSH is the shorthand used to indicate records or care coming from an outside hospital or facility, meaning the information was generated elsewhere before the current encounter. This helps the care team know to expect prior notes, imaging, or test results from another institution.

Why the others don’t fit: R/O stands for rule out, a phrase used during diagnostic reasoning rather than indicating the information source. Pt is the abbreviation for patient. PMHx stands for past medical history. None of these describe where the information came from, whereas OSH specifically denotes outside hospital.