Human language is misleading here, as we use syntactically similar expression to represent categorically distinct entities, e.g. "Ectopic pregnancy" vs. "Suspected pregnancy". The first one refers to a real pregnancy, the second one to a piece of (uncertain) "information". In SNOMED CT most (but not all) of these context-dependent concepts are concentrated in the subhierachy "Situation with explicit context". A major reason for why such concepts cannot be dispensed with is that SNOMED CT takes on, in many cases, the functionality of information models, as the latter do not exist in a given implementation.