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Relation extraction

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Text Analytics for health features relation extraction, which is used to identify meaningful connections between concepts, or entities, mentioned in the text. For example, a "time of condition" relation is found by associating a condition name with a time. Another example is a "dosage of medication" relation, which is found by relating an extracted medication to its extracted dosage. The following example shows how relations are expressed in the JSON output.

Note

  • Relations referring to CONDITION may refer to either the DIAGNOSIS entity type or the SYMPTOM_OR_SIGN entity type.
  • Relations referring to MEDICATION may refer to either the MEDICATION_NAME entity type or the MEDICATION_CLASS entity type.
  • Relations referring to TIME may refer to either the TIME entity type or the DATE entity type.

Relation extraction output contains URI references and assigned roles of the entities of the relation type. For example, in the following JSON:

"relations": [
    {
        "relationType": "DosageOfMedication",
        "entities": [
            {
                "ref": "#/results/documents/0/entities/0",
                "role": "Dosage"
            },
            {
                "ref": "#/results/documents/0/entities/1",
                "role": "Medication"
            }
        ]
    },
    {
        "relationType": "RouteOfMedication",
        "entities": [
            {
                "ref": "#/results/documents/0/entities/1",
                "role": "Medication"
            },
            {
                "ref": "#/results/documents/0/entities/2",
                "role": "Route"
            }
        ]
    }
]

Recognized relations

The following list presents all the recognized relations by the Text Analytics for health API.

ABBREVIATION

AMOUNT_OF_SUBSTANCE_USE

BODY_SITE_OF_CONDITION

BODY_SITE_OF_TREATMENT

COURSE_OF_CONDITION

COURSE_OF_EXAMINATION

COURSE_OF_MEDICATION

COURSE_OF_TREATMENT

DIRECTION_OF_BODY_STRUCTURE

DIRECTION_OF_CONDITION

DIRECTION_OF_EXAMINATION

DIRECTION_OF_TREATMENT

DOSAGE_OF_MEDICATION

EXAMINATION_FINDS_CONDITION

EXPRESSION_OF_GENE

EXPRESSION_OF_VARIANT

FORM_OF_MEDICATION

FREQUENCY_OF_CONDITION

FREQUENCY_OF_MEDICATION

FREQUENCY_OF_SUBSTANCE_USE

FREQUENCY_OF_TREATMENT

MUTATION_TYPE_OF_GENE

MUTATION_TYPE_OF_VARIANT

QUALIFIER_OF_CONDITION

RELATION_OF_EXAMINATION

ROUTE_OF_MEDICATION

SCALE_OF_CONDITION

TIME_OF_CONDITION

TIME_OF_EVENT

TIME_OF_EXAMINATION

TIME_OF_MEDICATION

TIME_OF_TREATMENT

UNIT_OF_CONDITION

UNIT_OF_EXAMINATION

VALUE_OF_CONDITION

VALUE_OF_EXAMINATION

VARIANT_OF_GENE

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