"r/o" meaning in English

{
  "forms": [
    {
      "form": "o",
      "tags": [
        "canonical"
      ]
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  "head_templates": [
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        "2": "verb"
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      "expansion": "o",
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  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out",
          "word": "rule out"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Medicine",
          "orig": "en:Medicine",
          "parents": [
            "Biology",
            "Healthcare",
            "Sciences",
            "Health",
            "All topics",
            "Body",
            "Fundamental"
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          "source": "w"
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      ],
      "examples": [
        {
          "text": "Alternative form: R/O"
        },
        {
          "ref": "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:",
          "text": "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.",
          "type": "quote"
        },
        {
          "ref": "2009, Kristen L. Longstreth, “Pulmonary Embolism”, in Terry L. Schinghammer, Julia M. Koehler, editors, Pharmacotherapy Casebook: A Patient-Focused Approach, 7th edition, McGraw Hill, →DOI, →ISBN, page 62:",
          "text": "Chest pain, SOB [shortness of breath]—most likely non-cardiac, R/O PE [pulmonary embolism], R/O pneumonia",
          "type": "quote"
        }
      ],
      "glosses": [
        "Initialism of rule out: used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out."
      ],
      "id": "en-r/o-en-verb-MT-W-6La",
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "rule out",
          "rule out#English"
        ]
      ],
      "raw_glosses": [
        "(medicine) Initialism of rule out: used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "topics": [
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "r/o"
}

{
  "forms": [
    {
      "form": "o",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "verb"
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      "expansion": "o",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out",
          "word": "rule out"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English terms with quotations",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Medicine"
      ],
      "examples": [
        {
          "text": "Alternative form: R/O"
        },
        {
          "ref": "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:",
          "text": "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.",
          "type": "quote"
        },
        {
          "ref": "2009, Kristen L. Longstreth, “Pulmonary Embolism”, in Terry L. Schinghammer, Julia M. Koehler, editors, Pharmacotherapy Casebook: A Patient-Focused Approach, 7th edition, McGraw Hill, →DOI, →ISBN, page 62:",
          "text": "Chest pain, SOB [shortness of breath]—most likely non-cardiac, R/O PE [pulmonary embolism], R/O pneumonia",
          "type": "quote"
        }
      ],
      "glosses": [
        "Initialism of rule out: used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out."
      ],
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "rule out",
          "rule out#English"
        ]
      ],
      "raw_glosses": [
        "(medicine) Initialism of rule out: used to indicate that a certain possible diagnosis should be considered, and appropriate tests performed to rule it out."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "topics": [
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "r/o"
}