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18.4.14 ADT/ACK - Patient Goes on a Leave of Absence (Event A21) (3.3.21)

An A21 event is sent to notify systems that an admitted patient has left the healthcare institution temporarily. It is used for systems in which a bed is still assigned to the patient, and it puts the current admitted patient activities on hold. For example, it is used to notify dietary services and laboratory systems when the patient goes home for the weekend.

The fields included when this message is sent should be the fields pertinent to communicate this event. When other important fields change, it is recommended that the A08 (update patient information) event be used in addition.

As there is no specific field for the LOA start date/time, it is recommended field EVN-6 - Event Occurred contain the date/time the patient actually left. PV2-47 - Expected LOA Return Date/Time is used to communicate the date/time the patient is expected to return from LOA.

Segment Cardinality Implement Status
ADT^A21^ADT_A21
MSH

Message Header

 [1..1] SHALL
ARV

Access Restriction

  
UAC

User Authentication Credential Segment

 [0..1]  
EVN

Event Type

 [1..1] SHALL
PID

Patient Identification

 [1..1] SHALL
PD1

Patient Additional Demographic

 [0..1]  
PV1

Patient Visit

 [1..1] SHALL
PV2

Patient Visit - Additional Information

 [0..1]  
DB1

Disability

  
OBSERVATION  
OBX

Observation/Result

 [1..1] SHALL
PRT

Participation Information

  

 

ADT_A21

MSH-15 MSH-16 Immediate ACK Application Ack
Blank Blank - ADT^A33^ADT_A21
Blank Blank - ADT^A23^ADT_A21
Blank Blank - ADT^A25^ADT_A21
Blank Blank - ADT^A27^ADT_A21
Blank Blank - ADT^A29^ADT_A21
Blank Blank - ADT^A22^ADT_A21
Blank Blank - ADT^A21^ADT_A21
Blank Blank - ADT^A26^ADT_A21
Blank Blank - ADT^A32^ADT_A21
NE NE - -
NE NE - -
NE NE - -
NE NE - -
NE NE - -
NE NE - -
NE NE - -
NE NE - -
NE NE - -
AL, SU, ER NE ACK^A27^ACK -
AL, SU, ER NE ACK^A26^ACK -
AL, SU, ER NE ACK^A32^ACK -
AL, SU, ER NE ACK^A21^ACK -
AL, SU, ER NE ACK^A25^ACK -
AL, SU, ER NE ACK^A23^ACK -
AL, SU, ER NE ACK^A29^ACK -
AL, SU, ER NE ACK^A22^ACK -
AL, SU, ER NE ACK^A33^ACK -
NE AL, SU, ER - ACK^A25^ACK
NE AL, SU, ER - ACK^A26^ACK
NE AL, SU, ER - ACK^A23^ACK
NE AL, SU, ER - ACK^A27^ACK
NE AL, SU, ER - ACK^A29^ACK
NE AL, SU, ER - ACK^A32^ACK
NE AL, SU, ER - ACK^A33^ACK
NE AL, SU, ER - ACK^A21^ACK
NE AL, SU, ER - ACK^A22^ACK
AL, SU, ER AL, SU, ER ACK^A27^ACK ACK^A27^ACK
AL, SU, ER AL, SU, ER ACK^A26^ACK ACK^A26^ACK
AL, SU, ER AL, SU, ER ACK^A32^ACK ACK^A32^ACK
AL, SU, ER AL, SU, ER ACK^A25^ACK ACK^A25^ACK
AL, SU, ER AL, SU, ER ACK^A33^ACK ACK^A33^ACK
AL, SU, ER AL, SU, ER ACK^A21^ACK ACK^A21^ACK
AL, SU, ER AL, SU, ER ACK^A23^ACK ACK^A23^ACK
AL, SU, ER AL, SU, ER ACK^A22^ACK ACK^A22^ACK
AL, SU, ER AL, SU, ER ACK^A29^ACK ACK^A29^ACK
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