Accession: "An increase by means of something added to record as acquired" - Websters. Accessioning is the act of taking on the responsibility to perform a laboratory test and adding the test to the laboratory's workload (hence the word accession, the workload or responsibility has been increased). While the definition would imply a close alignment with the Lab Test Promise, in practice, the Accession (and the "Accession Number") are more closely associated with the Specimen, as the Specimen represents a unit of work. Accession numbers and specimen numbers are often related, and when a specimen is subsetted for some other purpose, a new accession number may be created. This class represents the act of creating a new accession, and is associated with both the Promise and the Specimen.

Attributes
«TS» PointInTime	accessionDate	The date/time upon which the laboratory accepted the unit of work into its workload. This date/time might be the same as the Laboratory Promise date, or the date/time that the laboratory received the Specimen(s), depending on local laboratory practice.
«II» Id	accessionId	Uniquely identifies the accession. The accession is closely associated with both the Promise to perform a laboratory test, and the Specimen(s) upon which the tests are performed. The accession id therefore may be based upon the LabTestPromise.fillerOrderId or the Specimen.id, or conversely, those ids might be based upon this accessionId, depending on local laboratory practice. For example, if the accession id is ABCD, and two samples were received, one sample id might be ABCD-01 and the other ABCD-02. The accession id therefore may be used to identify the laboratory promise, samples, and results. "This field contains accession identifier(s) associated with the specimen...." - HL7 Version 2.8, SPM-30. "The identifier assigned by the lab when accessioning specimen(s). This is not necessarily the same as the specimen identifier, depending on local lab procedures." - HL7 FHIR, Specimen.accessionIdentifier
Specimen	specimen	Identifies the specimen(s) associated with the accession.

 accessionDate

Public «TS» PointInTime accessionDate

The date/time upon which the laboratory accepted the unit of work into its workload. This date/time might be the same as the Laboratory Promise date, or the date/time that the laboratory received the Specimen(s), depending on local laboratory practice.

Constraints:

Properties:

Aggregation	None
Alias
Association
Association End
Class	AccessionEvent
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
Keywords
Lower	1
Lower Value	(1)
Multiplicity	1
Name	accessionDate
Name Expression
Namespace	AccessionEvent
Opposite
Owner	AccessionEvent
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Lab::AccessionEvent::accessionDate
Stereotype
Template Parameter
Type	«TS» PointInTime
Upper	1
Upper Value	(1)
Visibility	Public

 accessionId

Public «II» Id accessionId

Uniquely identifies the accession. The accession is closely associated with both the Promise to perform a laboratory test, and the Specimen(s) upon which the tests are performed. The accession id therefore may be based upon the LabTestPromise.fillerOrderId or the Specimen.id, or conversely, those ids might be based upon this accessionId, depending on local laboratory practice. For example, if the accession id is ABCD, and two samples were received, one sample id might be ABCD-01 and the other ABCD-02. The accession id therefore may be used to identify the laboratory promise, samples, and results.

"This field contains accession identifier(s) associated with the specimen...." - HL7 Version 2.8, SPM-30.
"The identifier assigned by the lab when accessioning specimen(s). This is not necessarily the same as the specimen identifier, depending on local lab procedures." - HL7 FHIR, Specimen.accessionIdentifier

Constraints:

Properties:

Aggregation	None
Alias
Association
Association End
Class	AccessionEvent
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
Keywords
Lower	1
Lower Value	(1)
Multiplicity	1
Name	accessionId
Name Expression
Namespace	AccessionEvent
Opposite
Owner	AccessionEvent
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Lab::AccessionEvent::accessionId
Stereotype
Template Parameter
Type	«II» Id
Upper	1
Upper Value	(1)
Visibility	Public

 specimen

Public Specimen specimen

Identifies the specimen(s) associated with the accession.

Constraints:

Properties:

Aggregation	None
Alias
Association	(specimen:Specimen)
Association End
Class	AccessionEvent
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
Keywords
Lower	0
Lower Value	(0)
Multiplicity	*
Name	specimen
Name Expression
Namespace	AccessionEvent
Opposite
Owner	AccessionEvent
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Lab::AccessionEvent::specimen
Stereotype
Template Parameter
Type	Specimen
Upper	*
Upper Value	(*)
Visibility	Public