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  1. (medicine) Initialism of rule out: used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out.
    Alternative form: R/O
    • 2006, “Gastroenterology: Esophageal Foreign Bodies”, in Steven E. Diaz, The Little Black Book of Emergency Medicine (Jones and Bartlett's Little Black Book Series), 2nd edition, Sudbury, MA: Jones and Bartlett Publishers, →ISBN, page 101:
      CXR [chest X-ray] to r/o aspiration, and to identify location if radio-opaque. Consider lateral neck film or abdominal film if unable to locate object in chest. Barium swallow if still uncertain.
    • 2009, Kristen L. Longstreth, “Pulmonary Embolism”, in Terry L. Schinghammer, Julia M. Koehler, editors, Pharmacotherapy Casebook: A Patient-Focused Approach[1], 7th edition, McGraw Hill, →DOI, →ISBN, page 62:
      Chest pain, SOB [shortness of breath]—most likely non-cardiac, R/O PE [pulmonary embolism], R/O pneumonia