Modifiers allow to express that a fact is not a statement about a patient, but about another fact. They supplement the expressibility of CONCEPTs. The usage of modifiers is advices when:
- Statements are an extension to a repeatable statement (location, cuff size for blood pressure)
- Modifiers can be reused in many other parts of the ontology (degree of severity, level of expertise, measurement methods). One example is to differ between primary and secondary diagnose by 2 modifiers that are inherited to the whole diagnosis tree.
- Modifiers are used already, e.g. in a biomaterial setting: if modifiers are used for tracking number, kind of material, drawn_by, and so on, one would of course model pathogen as a modifier as well.