data item medical observation data observation http://ohdsi.github.io/CommonDataModel/cdm54.html#OBSERVATION Long Tran, Oliver He A data item that captures clinical facts about a patient obtained in the context of examination, questioning or a procedure. This term is dervied from OMOP:Observation term. Observations differ from Measurements in that they do not require a standardized test or some other activity to generate clinical fact. Typical observations are medical history, family history, the stated need for certain treatment, social circumstances, lifestyle choices, healthcare utilization patterns, etc. medical observation