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In this screenshot, we would say that i2b2 is displaying an ontology with 13 top-level ontology trees or categories, namely: Clinical Trials, Custom Metadata, Demographics, Diagnoses, etc.

For instance

Here are some examples of child-parent (or is-a) relationships found in i2b2's ontologies of healthcare concepts:

• diabetes mellitus is an endocrine disorder, which is a type of diagnosis; it will be found in both the "Diagnoses" tree and in the "Diagnoses (ICD10)" tree;
• aspirin is a non-steroidal anti-inflammatory drug, which is an analgesic, which is a type of medication; it will be found in the "Medications" tree;
• tonsillectomy is a type of surgery, which is a procedure; it will be found in the "Procedures" tree;
• hemoglobin A1c is a blood test, which is a type of laboratory test; it will be found in the "Laboratory Tests" tree; and
• race is a patient-demographic descriptor; it will be found in the "Demographics" tree.

Here is another screenshot, where you can see the expansion for "Race" in the "Demographics" tree:

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Where do i2b2 ontology "concepts" come from?

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