http://terminology.hl7.org/CodeSystem/v3-ActClass| Code | Display | Definition |
| BATTERY | battery | **Definition:** An observation that is composed of a set of observations. These observations typically have a logical or practical grouping for generally accepted clinical or functional purposes, such as observations that are run together because of automation. A battery can define required and optional component observations and, in some cases, will define complex rules that determine whether or not a particular observation is made. BATTERY is a constraint on the Observation class in that it is understood to always be composed of component observations. **UsageNotes:** The focus in a BATTERY is that it is composed of individual observations. In request (RQO) mood, a battery is a request to perform the component observations. In event (EVN) mood a battery is a reporting of associated set of observation events. In definition mood a battery is the definition of the associated set of observations. **Examples:** Vital signs, Full blood count, Chemistry panel. |
| CLUSTER | Cluster | **Description:**An ACT that organizes a set of component acts into a semantic grouping that have a shared subject. The subject may be either a subject participation (SBJ), subject act relationship (SUBJ), or child participation/act relationship types. **Discussion:** The focus in a CLUSTER act is the grouping of the contained acts. For example "a request to cluster" (RQO), "a type of cluster that is allowed to occur" (DEF), etc. **Examples:** * Radiologic investigations that might include administration of a dye, followed by radiographic observations; * "Isolate cluster" which includes all testing and specimen processing performed on a specific isolate; * a set of actions to perform at a particular stage in a clinical trial. |