The position of the body when the observation was done, e.g., standing, sitting. To be used only when the body position in not precoordinated in the observation code.

The qualitative change in the value relative to the previous measurement. Usually only recorded if the change is clinically significant.

The focus of an observation when not the patient of record (i.e different from Observation.subject). For example, the focal subject may be a fetus, or a donor.