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This is an abbreviation for UK National Health Service.
A government funded service delivering health care services to all United Kingdom (UK) citizens.
The National Health Service (NHS) Digital provides standards for collecting and publishing data and information for the health and social care system in England.
The NHS and the College of American Pathologists collaborated on the development of SNOMED CT.
The NHS is a founding Member of SNOMED International.
National Health Service
NHS
UK NHS
This is an abbreviation for National Library of Medicine.
The largest medical library in the world, located in Bethesda, Maryland, US.
National Library of Medicine (NLM) is part of the National Institutes of Health, US Department of Health and Human Services (HHS).
The NLM represent the United States of America as a Member of SNOMED International. It also hosts the SNOMED CT National Release Center for the US.
NLM
A territory that is not represented by an Member in accordance with the IHTSDO Articles of Association.
The list of territories is published by the SNOMED International from time to time (see link below).
In accordance with SNOMED International Affiliate License agreements, fees are payable to SNOMED International for use of SNOMED CT in non-Member territories.
A service in which a computer system converts human-readable text and/or spoken language to formal representations of information.
The formal representations that result from natural language processing may be generated, analyzed, and processed by other software applications.
Structured records including SNOMED CT expressions may be generated by natural language processing.
NLP
Wikipedia
A concept that exists only to support navigation.
A n avigation concept is not suitable for recording or aggregating information.
All navigation concepts :
are direct subtypes of the concept navigational concept
have no other supertype or subtype relationships
Navigation concepts are only linked to other concepts by navigational links. These navigational links are represented using reference sets.
Navigation
Navigation hierarchy
Release File Specifications
Association Reference Set
Ordered Association Reference Set
Terminology Services Guide
Hierarchical Navigation
Reference Sets Practical Guide
Association Reference Set
Ordered Association Reference Set
This is a synonym for necessary normal form expression.
The necessary normal form expression represents the inferred view of an expression including all the relationships that are necessarily true, with redundancy removed. It is created from the output of the process of classifying the classifiable form expression with a predefined version of SNOMED CT.
The necessary normal form expression represents the relationships used for querying and data analytics over the expression.
It includes refinements that represent inferred relationships
It does not include any redundant refinements or redundant relationship groups
NNF expression
A characteristic that is always true of a concept.
Some necessary conditions can be represented as defining relationships but other necessary conditions that can be represented as OWL axioms cannot be represented as relationships.
The relationship file represents the inferred view of necessary conditions in that can be represented as relationships.
Prior to July 2018, SNOMED CT represented all necessary conditions in the stated view as defining relationships in the stated relationship file.
Changes introduced in the July 2018 release of the International Edition mean that in future necessary conditions __ in the stated view will be represented as axioms in the OWL axiom reference set file.
A concept that represents an extension namespace identifier.
All namespace concepts are subtypes of the concept _ 370136006 | Namespace concept| _.
The namespace identifier is represented in an associated description. The concept identifier of the namespace concept does not represent the namespace identifier.
The namespace concept hierarchy showing first few namespace concepts:
... more values ...
The necessary normal form expression represents the inferred view of an expression including all the relationships that are necessarily true, with redundancy removed. It is created from the output of the process of classifying the classifiable form expression with a predefined version of SNOMED CT.
The necessary normal form expression represents the relationships used for querying and data analytics over the expression.
It includes refinements that represent inferred relationships
It does not include any redundant refinements or redundant relationship groups
NNF expression
A source terminology used to develop SNOMED CT.
SNOMED RT was also used with NHS Clinical Terms Version 3 to develop SNOMED CT .
NHS Clinical Terms Version 3 is UK Crown Copyright, distributed by the United Kingdom National Health Service (NHS), and is integrated into SNOMED CT.
CTV3
Read Codes Version 3
This is an abbreviation for SNOMED CT National Edition.
A set of SNOMED CT components and reference set members that either belong to a focus module identified by a National Release Center (NRC), or belong to one of the modules on which that module depends.
The focus module is part of the National Release for which that NRC is responsible.
An NRC may have multiple National Editions with different focus modules for each edition.
be part of a National Release distributed to licensees.
combine a focus module from the National Release , the relevant versions of modules in the International Edition, and any other extension modules on which the focus module of the National Edition depends.
United States Edition
Canadian Edition
United Kingdom Clinical Edition (does not include UK drug extension modules)
United Kingdom Edition (includes UK drug extension modules)
National Edition
This may sometimes be used to refer to C-NPU.
A coded terminology used in clinical laboratory sciences.
C-NPU is maintained by the International Federation of Clinical Chemists (IFCC) in collaboration with the International Union of Pure and Applied Chemistry (IUPAC).
IFCC-IUPAC
Nomenclature, Properties and Units
NPU
The largest medical library in the world, located in Bethesda, Maryland, US.
National Library of Medicine (NLM) is part of the National Institutes of Health, US Department of Health and Human Services (HHS).
The NLM represent the United States of America as a Member of SNOMED International. It also hosts the SNOMED CT National Release Center for the US.
This is an abbreviation for extension namespace identifier.
A seven digit number allocated by SNOMED International to an organization that is permitted to maintain a SNOMED CT Extension.
The namespace identifier enables an authorized organization to generate a unique SNOMED CT identifier (SCTID) for each of their SNOMED CT components. It forms part of the SCTID assigned to every component created by that organization.
Short format SCTIDs, which are used for components that originate from SNOMED International, do not include a namespace identifier. For these SCTIDs the partition identifier provides sufficient information about the origin of the component.
Namespace identifier
NamespaceId
This is an abbreviation for necessary normal form.
An inferred view of a concept definition that includes only defining relationships that are necessarily true.
The necessary normal form is designed to represent an inferred view derived from the enhanced concept definitions in a form that can be distributed in the relationship file. Although the enhanced features cannot be fully represented within the structure of the relationship file, the necessary normal form provides a view of the results of classifying data that is accessible to those without access to description logic tools.
Changes introduced in the July 2019 release of the International Edition, enhanced the ability of SNOMED CT to support more advanced description logic. These changes allow the stated view of concept definitions to use axioms represent using the OWL Functional Syntax.
NNF
Refers to the process of generating a normal form normal form.
A SNOMED CT expression in which none of the referenced concepts are fully defined and where there is no redundancy or duplication of meaning.
In theory, an expression can be transformed to its normal form by replacing each reference to a fully defined concept with a nested expression that represents the definition of that concept. However, this process often results in redundancy or duplication of meaning requiring removal of less specific attribute values and mergers of attribute groups. Therefore, use of description logic classifier is more effective way to normalize and compare expressions.
Prior to the July 2019 International Edition, two normal form expressions could be compared to determine whether they were logically equivalent equivalence or whether one expression was subsumed by the other. The July 2019 release included enhancements to the description logic used by SNOMED CT. As a result of these enhancements, expression transformation is no longer a reliable option for subsumption testing. Instead, postcoordinated expressions should be classified using a description logic classifier to determine subsumption.
This is an abbreviation for natural language processing.
A service in which a computer system converts human-readable text and/or spoken language to formal representations of information.
The formal representations that result from natural language processing may be generated, analyzed, and processed by other software applications.
Structured records including SNOMED CT expressions may be generated by natural language processing.
NLP
Wikipedia
This is an abbreviation for SNOMED CT National Release.
The complete set of SNOMED CT components and reference set members distributed to licensees by a Member.
The National Release is a set of release files which contain components and derivatives from a National Extension maintained and distributed by a Member.
A National Release may also include the SNOMED CT International Release on which it depends, in which case it is a release of the National Edition.
Alternatively, a National Release may consist only of the National Extension release files for a specified release date. In this case, the National Edition combines these files with the International Release on which it depends.
The National Release made available on a particular date, is referred to as a National Release version.
National Release
A SNOMED CT expression in which none of the referenced concepts are fully defined and where there is no redundancy or duplication of meaning.
In theory, an expression can be transformed to its normal form by replacing each reference to a fully defined concept with a nested expression that represents the definition of that concept. However, this process often results in redundancy or duplication of meaning requiring removal of less specific attribute values and mergers of attribute groups. Therefore, use of description logic classifier is more effective way to normalize and compare expressions.
Prior to the July 2019 International Edition, two normal form expressions could be compared to determine whether they were logically equivalent equivalence or whether one expression was subsumed by the other. The July 2019 release included enhancements to the description logic used by SNOMED CT. As a result of these enhancements, expression transformation is no longer a reliable option for subsumption testing. Instead, postcoordinated expressions should be classified using a description logic classifier to determine subsumption.
An inferred view of a concept definition that includes only defining relationships that are necessarily true.
The necessary normal form is designed to represent an inferred view derived from the enhanced concept definitions in a form that can be distributed in the relationship file. Although the enhanced features cannot be fully represented within the structure of the relationship file, the necessary normal form provides a view of the results of classifying data that is accessible to those without access to description logic tools.
Changes introduced in the July 2019 release of the International Edition, enhanced the ability of SNOMED CT to support more advanced description logic. These changes allow the stated view of concept definitions to use axioms represent using the OWL Functional Syntax.
NNF
This is an abbreviation for UK National Health Service.
A government funded service delivering health care services to all United Kingdom (UK) citizens.
The National Health Service (NHS) Digital provides standards for collecting and publishing data and information for the health and social care system in England.
The NHS and the College of American Pathologists collaborated on the development of SNOMED CT.
The NHS is a founding Member of SNOMED International.
National Health Service
NHS
UK NHS
The process of locating a concept by traversing links represented by relationships or reference set members.
Navigation can supplement term based searching by providing logical or intuitive routes through SNOMED CT.
Viewing and/or selecting concepts that:
are more specific (or more general) by following subtype relationships.
share a common defining characteristic by traversing attribute relationships.
are practically related to a common use case by following links specified by an association reference set
are presented in a rational order represented by an ordered association reference set.
A hierarchical view of SNOMED CT concepts that differs from the subtype hierarchy and enables an alternative way to locate and view part or all of the concept of SNOMED CT.
SNOMED CT enables navigation hierarchies to be specified using either:
an ordered association reference set in which the display order of nodes can be specified; or
an association reference set which the display order is not specified.
The links in a navigation hierarchy do not contribute in any way to the semantic definitions of the linked concepts.
A navigation hierarchy may include navigation concepts which are created to represent nodes in the hierarchy exist only to organize the hierarchy and cannot be selected for data entry.
A navigation hierarchy may be limited to a subset of concepts relevant to a particular use case.
Many different navigation hierarchies can be created, each specifying a structure that meets the needs of a particular use case.
The organization within a Member territory that is responsible for maintaining and releasing SNOMED CT content, including any National extensions of SNOMED CT.
This is the full name for C-NPU.
A coded terminology used in clinical laboratory sciences.
C-NPU is maintained by the International Federation of Clinical Chemists (IFCC) in collaboration with the International Union of Pure and Applied Chemistry (IUPAC).
IFCC-IUPAC
Nomenclature, Properties and Units
NPU
This is an abbreviation for extension namespace identifier.
A seven digit number allocated by SNOMED International to an organization that is permitted to maintain a SNOMED CT Extension.
The namespace identifier enables an authorized organization to generate a unique SNOMED CT identifier (SCTID) for each of their SNOMED CT components. It forms part of the SCTID assigned to every component created by that organization.
Short format SCTIDs, which are used for components that originate from SNOMED International, do not include a namespace identifier. For these SCTIDs the partition identifier provides sufficient information about the origin of the component.
Namespace identifier
NamespaceId