hl7:observation
  | 
                                  | 
                                 1 … 1 | 
                                 R | 
                                 
                                    
                                     These acts are simply observations that have occurred, and so are recored using the
                                       <observation> element as shown above. 
                                     
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 @classCode
  | 
                                 cs | 
                                 1 … 1 | 
                                 F | 
                                 OBS | 
                              
                              
                                 @moodCode
  | 
                                 cs | 
                                 1 … 1 | 
                                 F | 
                                 EVN | 
                              
                              
                                 hl7:templateId
  | 
                                 II | 
                                 1 … 1 | 
                                 M | 
                                  | 
                                 (Ent ion) | 
                              
                              
                                 @root
  | 
                                 uid | 
                                 1 … 1 | 
                                 F | 
                                 1.3.6.1.4.1.19376.1.5.3.1.4.13.6 | 
                              
                              
                                 hl7:templateId
  | 
                                 II.EPSOS | 
                                 1 … 1 | 
                                 M | 
                                  | 
                                 (Ent ion) | 
                              
                              
                                 @root
  | 
                                 uid | 
                                 1 … 1 | 
                                 F | 
                                 1.3.6.1.4.1.19376.1.5.3.1.4.13 | 
                              
                              
                                 hl7:id
  | 
                                 II.EPSOS | 
                                 1 … 1 | 
                                 M | 
                                 
                                    
                                     Each observation shall have an identifier.  
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 hl7:code
  | 
                                 CD | 
                                 1 … 1 | 
                                 M | 
                                 
                                    
                                     Observations shall have a code describing what was measured. The code system used
                                       is determined by the vocabulary constraints on the types of measurements that might
                                       be recorded in a section. Content modules that are derived from the Simple Observation
                                       content module may restrict the code system and code values used for the observation.
                                       
                                     
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 @code
  | 
                                 CONF | 
                                 1 … 1 | 
                                 F | 
                                 34530-6 | 
                              
                              
                                 @codeSystem
  | 
                                 1 … 1 | 
                                 F | 
                                 2.16.840.1.113883.6.1 (LOINC) | 
                              
                              
                                 hl7:text
  | 
                                 ED | 
                                 1 … 1 | 
                                 R | 
                                 
                                    
                                     Each observation measurement entry may contain a <text> element providing the free
                                       text that provides the same information as the observation within the narrative portion
                                       of the document with a <text> element. For CDA based uses of Simple Observations,
                                       this element SHALL be present, and SHALL contain a <reference> element that points
                                       to the related string in the narrative portion of the document. For HL7 Version 3
                                       based uses, the <text> element MAY be included. 
                                     
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 hl7:statusCode
  | 
                                 CD | 
                                 1 … 1 | 
                                 M | 
                                 
                                    
                                     The status code of all observations shall be completed.  
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 @code
  | 
                                 CONF | 
                                 1 … 1 | 
                                 F | 
                                 completed | 
                              
                              
                                 hl7:effectiveTime
  | 
                                 IVL_TS | 
                                 1 … 1 | 
                                 R | 
                                 
                                    
                                     The <effectiveTime> element shall be present in standalone observations , and shall
                                       record the date and time when the measurement was taken. This element should be precise
                                       to the day. If the date and time is unknown, this element should record that using
                                       the nullFlavor attribute. 
                                     
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 hl7:value
  | 
                                 CV.EPSOS | 
                                 1 … * | 
                                 R | 
                                 
                                    
                                     The value of the observation shall be recording using a data type appropriate to the
                                       observation. Content modules derived from the Simple Observation content module may
                                       restrict the allowable data types used for the observation. 
                                     
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 |   | 
                                 CONF | 
                                 
                                    
                                  | 
                              
                              
                                 hl7:interpretationCode
  | 
                                 CE extensible | 
                                 0 … * | 
                                 R | 
                                 
                                    
                                     If there is an interpretation that can be performed using an observation result (e.g.,
                                       high, borderline, normal, low), these may be recorded within the interpretationCode
                                       element. 
                                     
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 hl7:methodCode
  | 
                                 CE extensible | 
                                 0 … * | 
                                 R | 
                                 
                                    
                                     The methodCode element may be used to record the specific method used to make an observation
                                       when this information is not already pre-coordinated with the observation code . 
                                     
                                    
                                  | 
                                 (Ent ion) | 
                              
                              
                                 hl7:targetSiteCode
  | 
                                 CD extensible | 
                                 0 … * | 
                                 R | 
                                 
                                    
                                     The targetSiteCode may be used to record the target site where an observation is made
                                       when this information is not already pre-coordinated with the observation code. 
                                     
                                    
                                  | 
                                 (Ent ion) |