This European Standard specifies the definition and structuring of information relating to entities that are commonly encountered in communications with and between clinical information computer systems. Within the scope of this European Standard is a description of components and their use. In particular, these components relate to the following sub-domains: - Analysable objects: including samples, body parts, x-rays and other study products, together with their collection and properties. - Clinical information: including observations, patient conditions, procedures, medication treatment, investigations, counselling plus how these items are organised within a record. - Medicinal products: including appliances, dosage regimes,etc. - Routing aspects of medication treatment or other procedures. Care Service information: including referrals for care services, care encounter information and scheduling.