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Glossary refMigration from 

from
Gloss
glossary-ref
tSNOMED
RT
 poses very few significant issues, since many features of the design of of glossary-ref
Gloss
tSNOMED
CT
 including the use
of of glossary-ref
Gloss
tSCTIDs
were  were incorporated into into glossary-ref
Gloss
tSNOMED
RT
.
The

Thus transition to to 

glossary-ref
Gloss
tSNOMED
CT
for  for users of of glossary-ref
Gloss
tSNOMED
RT
is  is relatively straightforward because the Glossary ref Concept Identifiers in  of
Gloss
glossary-ref
tSNOMED
RT
are for  are the most part the same as those used in Glossary refSNOMED the concept.id uses in 
Gloss
tSNOMED CT
.

In some cases, during or after the merger of of 

glossary-ref
Gloss
tSNOMED
RT
and  and  some
Glossary ref
Clinical Terms Version 3
Glossary ref
Concepts
in
Glossary ref
SNOMED RT
have been
Gloss
tNHS Clinical Terms Version 3
 some concept in 
Gloss
tSNOMED RT
 were found to be ambiguous or duplicated. These
Glossary ref
Concepts
have been inactivated by an appropriate change of status and adding a record in the Component Inactivation
Glossary ref
Reference Sets
, but are still present in the Concepts Table and are linked to
Glossary ref
Active Concepts
by the Historical Associations
Glossary ref
Reference Set
:

...

Glossary ref
Concept

...

Scg expression
ShowPartsterm
168666000|SAME AS|

...

Glossary ref
Active Concept

...

Glossary ref
Concept

...

Glossary ref
Concept

...

Scg expression
ShowPartsterm
149016008|MAY BE A|

...

Glossary ref
Active Concepts

...

Even in these cases the concepts with original identifier are still present in the 

Gloss
tSNOMED CT
 Concepts Table but have been inactivated.  Records in the Concept Inactivation Reference Set indicate the reason for inactivation and records in the appropriate Historical Association Reference Set can be used to locate the appropriate active concept identifier. 

For information about historical reference sets please see the following:

These Associations can be used either to allow allow 

glossary-ref
Gloss
Concepts
t
recorded
concepts
 recorded using these
Glossary ref
Concepts
identifiers to be recognized by retrieval tools or to enable mapping of the stored information to the appropriate active glossary-ref
Gloss
active
t
Glossary ref
Concept Identifier
concepts
.


If any stored

Glossary ref
Concept Identifier

of an


Glossary ref
Inactive Concept

is mapped to an


Glossary ref
active
Glossary ref
Concept Identifier

using these Associations it is strongly recommended that the original


Glossary ref
Concept Identifier

is also retained. This enables future improvements or corrections of such mappings if revised Associations are present in a future release of


Glossary ref
SNOMED CT

.


In addition,

Glossary ref
SNOMED RT

contained both generic and brand name drugs for the US. A decision was made during the merger process to not retire these


Glossary ref
concepts

using the


Glossary ref
extension

mechanisms, but to place these components directly in the US Drug


Glossary ref
Extension

. Therefore to access all


Glossary ref
SNOMED RT
Glossary ref
components

you will need to use the US Drug


Glossary ref
Extension

in addition to the


Glossary ref
SNOMED CT International Release

.


Like

Glossary ref
SNOMED CT

,


Glossary ref
SNOMED RT

also contains the appropriate legacy SNOMEDID from

Glossary ref
SNOMED International

.