A record of a request for service such as diagnostic investigations, treatments, or operations to be performed. When the ServiceRequest is active, it represents an authorization to perform the service. A record of a request for service such as diagnostic investigations, treatments, or operations to be performed. When the ServiceRequest is active, it represents an authorization to perform the service. If the element is present, it must have either a @value, an @id, or extensions Identifiers assigned to this order instance by the orderer and/or the receiver and/or order fulfiller. Plan/proposal/order fulfilled by this request. The request takes the place of the referenced completed or terminated request(s). A shared identifier common to all service requests that were authorized more or less simultaneously by a single author, representing the composite or group identifier. The status of the order. Provides reason why the service request status is what it is. The statusReason can be used to explain why a service request is suspended, cancelled, or on hold, including administrative and clinical reasons. Whether the request is a proposal, plan, an original order or a reflex order. A code that classifies the service for searching, sorting and display purposes (e.g. "Surgical Procedure"). Indicates how quickly the ServiceRequest should be addressed with respect to other requests. Set this to true if the record is saying that the service/procedure should NOT be performed. A code or reference that identifies a particular service (i.e., procedure, diagnostic investigation, or panel of investigations) that has been requested. Additional details and instructions about how the services are to be delivered. For example, an order for a urinary catheter may have an order detail for an external or indwelling catheter, or an order for a bandage may require additional instructions specifying how the bandage should be applied. Questions or additional information to be gathered from a patient may be included here. An amount of service being requested. On whom or what the service is to be performed. This is usually a human patient, but can also be requested on animals, groups of humans or animals, devices such as dialysis machines, or even locations (typically for environmental scans). The actual focus of a service request when it is not the subject of record representing something or someone associated with the subject such as a spouse, parent, fetus, or donor. The focus of a service request could also be an existing condition, an intervention, the subject's diet, another service request on the subject, or a body structure such as tumor or implanted device. An encounter that provides additional information about the healthcare context in which this request is made. The date/time at which the requested service should occur. Indicates that the service (e.g., procedure, lab test) should be performed when needed (Boolean option). Indicates specific criteria that need to be met to perform the service (e.g., lab results or symptoms). When the request transitioned to being actionable. The individual who initiated the request and has responsibility for its activation. Desired type of performer for doing the requested service. The desired performer for doing the requested service. For example, the surgeon, dermatopathologist, endoscopist, etc. The preferred location(s) where the procedure should actually happen in coded or free text form. E.g. at home or nursing day care center. The reason or the indication for requesting the service (e.g., procedure, lab test). Insurance plans, coverage extensions, pre-authorizations and/or pre-determinations that may be needed for delivering the requested service. Additional clinical information about the patient or specimen that may influence the services or their interpretations. This information includes diagnosis, clinical findings and other observations. In laboratory ordering these are typically referred to as 'ask at order entry questions (AOEs).' This includes observations explicitly requested by the producer (filler) to provide context or supporting information needed to complete the order. For example, reporting the amount of inspired oxygen for blood gas measurements. Anatomic location where the procedure should be performed. This is the target site. Any other notes and comments made about the service request. For example, internal billing notes. Instructions in terms that are understood by the patient or consumer. Key events in the history of the request. A record of a request for service such as diagnostic investigations, treatments, or operations to be performed. When the ServiceRequest is active, it represents an authorization to perform the service. Indicates the context of the order details by reference. The parameter details for the service being requested. A record of a request for service such as diagnostic investigations, treatments, or operations to be performed. When the ServiceRequest is active, it represents an authorization to perform the service. A value representing the additional detail or instructions for the order (e.g., catheter insertion, body elevation, descriptive device configuration and/or setting instructions). Indicates a value for the order detail. A record of a request for service such as diagnostic investigations, treatments, or operations to be performed. When the ServiceRequest is active, it represents an authorization to perform the service. Instructions in terms that are understood by the patient or consumer.