SNOMED CT® Release Format 1 (RF1) Guide - ihtsdo

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116 | SNOMED CT Release Format 1 (RF1) Guide July 2012 3.2.6. Cross-Mapping The Cross Mapping mechanism enables distribution of Cross Maps from SNOMED CT in a common structure. Cross Mappings ensure that SNOMED CT can be used to effectively reference other terminologies and classifications. Each cross map matches SNOMED CT concepts with another coding scheme that is called the "target scheme ". The cross mapping structure enables: • Automatic mapping from one SNOMED CT Concept to a single appropriate matching code in the Target Scheme; • Automatic mapping from one SNOMED CT Concept to a single collection of codes in a Target Scheme that together represent the same Concept; • Manual choice from a set of options for mapping a SNOMED CT Concept to a Target Scheme with several possible ways of representing the same or similar Concepts. The cross mapping structure does not enable: • Mapping from post-coordinated collections of SNOMED CT Concepts to a single Target Code or a specific collection of Target Codes (e.g. mapping a combination of a disorder qualified by severity or a procedure qualified by urgency). • Mapping from multiple fields in a patient record to a specific Target Code that represents a combination of characteristics (e.g. mapping a combination of a disorder, procedure and the age and sex of the patient to a single grouper code). This structure is based on the practical experience of the Cross Mapping tables of Clinical Terms Version 3 (CTV3), which is one of SNOMED CT's source terminologies. The Cross Mapping Mechanism function is designed to be flexible in its support of: 1. The number of source concepts mapped: • A Target Scheme may include codes for: • A single SNOMED CT Concept: • Example: A disorder Concept may map directly to an ICD classification code. • A single statement consisting of a post-coordinated set of Concepts: • Example: A procedure Concept qualified by an urgency Concept may map to a target procedure code. • Several separate statements each represented using SNOMED CT Concepts: • Example: A diagnosis Concept plus a procedure Concept may map to a grouper code. • One or more statements represented using SNOMED CT Concepts combined with additional information that is not represented as a SNOMED CT Concept: • Example: A disorder Concept plus the age and sex of the person may map to an ICD classification code. • Current support is for mapping from a single SNOMED CT Concept. Additional functions may be considered in the future. 2. The number of Target Codes: • A Target Scheme may represent a mapped Concept as: • a single code; © 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434
• as a combination of codes; • a choice of several possible mappings consisting of one or more codes. • Current support is for a single Target Code, multiple Target Codes, and a choice of single or multiple Target Codes. 3. The accuracy of mapping: • A target mapping may represent a Concept: • precisely. • imprecisely: • target more specific than source; • target less specific than source; • imprecise but neither more nor less specific. • An indication of accuracy can be associated with each Cross Map. Practical requirements for mapping from SNOMED CT to other terminologies or classifications (Target Schemes) are not limited to mapping single Concepts in SNOMED CT to single Target Codes. The more general problem is to map information in a patient record that has been encoded using SNOMED CT Concepts into an appropriate Target Code or set of Target Codes. It will be impossible to map some Concepts to any Target Codes in some Target Schemes. A SNOMED CT Concept may be unmappable for one of several reasons: • It expresses a concept that is outside the domain covered by the Target Scheme • It is insufficiently detailed to provide a meaningful cross mapping: • In this case a mappable code may be found by refining the SNOMED CT Concept (i.e. selecting an | is a | descendant). • It is too detailed and information will be lost in the mapping: • If this loss of detail is unimportant with respect to the purpose of the mapping, it is possible to map the most proximal more generalized Concept that is mappable, or to create the map but indicate that the match is not 1:1. • It is inappropriate to map the concept: Release File Formats | 117 • For example, disorders that do not apply to humans need not be mapped to an ICD-9 code. © 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434
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SNOMED CT ® Release Format 1 (RF1)
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Contents | 3 Release Format 1 - Det
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Chapter 1 Preface The purpose of th
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Table 3: Document Types Type Name a
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IHTSDO Glossary (DRAFT) • On line
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Chapter 2 Structure and Content Gui
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Figure 1: Multiple levels of granul
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Table 5: Example: Defining arthriti
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The full definitions of the concept
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Other components (i.e. Relationship
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2.1.2.2.1.3. Linking related Concep
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• Local content requirements that
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Consistent representation is a prer
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Figure 8: Abstract logical model of
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1. As originally stated: : • | Ha
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2.2.1.3.2.3.1. Supertype aspects of
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Figure 11: Example hierarchy with l
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Concept E F G H J K L M Note: Compr
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Concept M List of proximal primitiv
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Table 11: Non-redundant attribute v
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G. | Severe upper limb laceration |
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As a result of this limitation some
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2.2.1.4.3. Historical relationships
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2.2.2.1.1.2. Refinement attribute n
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2.2.2.1.4.3. Use of "unapproved att
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Interim recommendations 1. Wherever
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2.2.2.3.1. Close-to-user expression
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It is important to note that combin
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2.2.2.3.6.1. Example of equivalent
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Figure 25: Alternative expressions
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Figure 27: Possible expressions of
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Figure 28: SCTID Short Format - App
Page 65 and 66: PartitionId 05 Description A Cross
Page 67 and 68: SctId 999999990989121104 2.3.2.9. T
Page 69 and 70: 2.3.3.2. Specification for Namespac
Page 71 and 72: 2.3.3.3.1.4. Procedures 2.3.3.3.1.4
Page 73 and 74: 1. Every Concept in an Extension:
Page 75 and 76: Table 17: Processing Transfers betw
Page 77 and 78: In May 2008, the HL7 Version 3 Stan
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Page 83 and 84: excision of left fallopian tube. No
Page 85 and 86: This existential restriction is lab
Page 87 and 88: • In order to generate the OWL ve
Page 89 and 90: • Though there are many candidate
Page 91 and 92: 2.3.7.2.2.1. Single byte encoding C
Page 93 and 94: 9 0 9 Table 29: The full array for
Page 95 and 96: else {document.getElementById("out"
Page 97 and 98: http://www.augustana.ab.ca/~mohrj/a
Page 99 and 100: version. It seems unwise to prevent
Page 101 and 102: Table DescDualKey Table ConcDualKey
Page 103 and 104: The IHTSDO recognizes that, while i
Page 105 and 106: 3.2.2. Release Format 1 - Structure
Page 107 and 108: 3.2.3.2. Core Tables Data - Structu
Page 109 and 110: Data Fields InitialCapitalStatus De
Page 111 and 112: 3.2.4.1. Subset Mechanism - Structu
Page 113 and 114: Data Fields ContextId 3.2.4.2.2. Su
Page 115: Subset SNOMED CT Top Level Navigati
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Page 121 and 122: Table 44: Cross Map Targets Table K
Page 123 and 124: The History Mechanism is also used
Page 125 and 126: In addition, the ReferencedId field
Page 127 and 128: Table Descriptions Descriptions Rel
Page 129 and 130: Table 49: Relationships depending o
Page 131 and 132: Table 51: Changes to Relationships
Page 133 and 134: Table 52: Changes to Relationships
Page 135 and 136: • The only Relationships that it
Page 137 and 138: ComponentId ConceptId ReleaseVersio
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Page 141 and 142: Value 6 10 11 Limited Moved elsewhe
Page 143 and 144: As new concepts are added to SNOMED
Page 145 and 146: Table 73: DescriptionStatus Values
Page 147 and 148: 3.2.9.2.2.4. InitialCapitalStatus T
Page 149 and 150: 3.2.9.3. relationships tables Each
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Page 153 and 154: An integer value that expresses an
Page 155 and 156: 3.2.9.4.1.2.4. SubsetType Table 95:
Page 157 and 158: A string that identifies a Context
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Page 161 and 162: • MemberStatus 3.2.9.4.2.3.1.1. S
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3.2.9.4.2.7.1.1. SubsetId Table 124
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3.2.9.4.2.8.1.3. MemberStatus Table
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3.2.9.4.3. Subset Definition File P
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3.2.9.5.1.2.3. MapSetSchemeId Table
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This discussion of rules is include
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3.2.9.5.1.3.2.3. MapRule Table 151:
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3.2.9.5.1.4.2.3. TargetRule Table 1
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RELAT_NMS = column in the LOINC tab
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The value of the SNOMED CT / LOINC
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The SNOMED CT Relationships Table e
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LOINC Analyte Name(s) DESMETHYLAMIO
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LOINC Analyte Name(s) COMPLEMENT IC
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The information provided includes d
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3.2.9.6.4.1.2. ReleaseVersion Table
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Value 6 7 8 9 10 11 Note: Name Limi
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3.2.9.6.5.1.1. ComponentId Table 17
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Release Format 1 is represents a sn
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RF1 Descriptions Table Descriptions
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Table 177: Concepts Table Use of re
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Use of recommended additional indic
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Use of recommended additional indic
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Table 184: Cross Map Sets Table Use
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Keys Partition Size Type Field Name
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Table 192: Word Equivalents Table U
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3.2.10. The Stated relationships ta
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Figure 41: Overview of Cross Map Sc
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Table 197: Cross Maps Sets Table Ma
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Table 201: Cross Maps Sets Table Ma
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Table 205: Cross Map Sets Table Map
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If this approach is followed, there
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This approach allows a more consist
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1. A record may contain many record
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• Temporally related to the selec
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CONCEPTID 95333004 7119001 95336007
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CONCEPTID 109778006 109788007 15270
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CONCEPTID 417163006 417746004 12820
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CONCEPTID 102706005 1677001 9145400
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CONCEPTID 399023006 399154007 39905
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CONCEPTID 399306005 399239005 39937
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CONCEPTID 125086000 78678003 388393
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CONCEPTID 339008 47002008 128419007
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CONCEPTID 16817006 15367004 1580700
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CONCEPTID 14509009 39250009 8627300
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CONCEPTID 122868007 122465003 78817
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CONCEPTID 19207007 74923002 6639100
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CONCEPTID 54305003 84100007 3216600
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CONCEPTID 255496004 255499006 24646
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CONCEPTID 62834003 5668004 34810001
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CONCEPTID 53224005 4150005 74636004
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CONCEPTID 47538007 19359003 3011000
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3.2.13. Enumerated values Value 0 1
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Table and Field Subsets SubsetType
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3.3. Release Format 2 Update Guide
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• The Release Format should minim
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3.3.3.4. Backward compatibility The
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3.3.4.5. Field Ordering Records in
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externalised structures such as Ref
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ContextId If either the RealmId fie
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eplaced by more descriptive ones if
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descriptions associated with concep
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Figure 45: Illustration of module d
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was inactivated. Each Reference ind
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Finally, add members to the Referen
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3.4.1. File Naming Convention - Ove
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• Test/Beta Release File("xsct",
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In certain cases, an RF1 data file
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VersionDate refers to the official,
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Example: Excluding the Fully Specif
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4.2.1.3. Pre-processing of distribu
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• Reject, highlight or apply othe
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Table 236: Essential concept Identi
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The purpose of this section of the
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Table 240: Example results for a Se
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• For each dual key, add rows to
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• Description104951019 is elimina
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4.4.1.4.1. Avoiding multiple hits o
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Table 248: Relationship Example Con
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• Since the depth of the hierarch
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4.4.2.5. Using navigation Subsets t
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Table 253: Concepts used in the Exa
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SubsetId Mem
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• 302402006 | radius and/or ulna
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Now we have tree nodes and their ch
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Subsets may be used to derive table
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• One Subset can be used as the b
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• A Context Concept Subset only r
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• A Navigation Subset specifies a
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• A RealmID identifies the specia
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4.5. Testing and traversing subtype
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This approach removes the need for
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4.5.5.2.4. Using the transitive clo
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Figure 55: Terminology server provi
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A field in the Component History Ta
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Cross maps table A data table consi
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• References Table Inactive compo
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A field in the Cross Maps Table tha
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A Subset that specifies sets of Nav
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A field in the Concepts Table that
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TargetId A SNOMED CT Identifier tha
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WordText A field in the Word Equiva
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