R/O stands for which term?

• A. Rule Out
• B. Rate Of
• C. Reason Of
• D. Rationale Of

Answer: (A)

The main idea here is understanding common medical abbreviations in charting and orders. R/O means you are considering a diagnosis but need to exclude it, so the term it stands for is “Rule Out.” In practice, you might see something like “R/O pulmonary embolism,” indicating tests and evaluations are underway to determine whether PE is present or not.

The other phrases aren’t used in this context: “Rate Of” would describe a measurement or speed, not a diagnostic action; “Reason Of” and “Rationale Of” aren’t standard abbreviations used to indicate excluding a diagnosis in clinical documentation.