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

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316 | SNOMED CT Release Format 1 (RF1) Guide July 2012 Table 246: Example Rows from Word Equivalents Table WordBlockNumber 1021 1021 4430 4430 4430 9870 9870 9870 9870 9870 WordText KIDNEY RENAL CALCULUS CALCULI STONE RENAL STONE KIDNEY STONE KIDNEY CALCULUS RENAL CALCULUS NEPHROLITH WordType 2 (word equivalent) 2 (word equivalent) 2 (word equivalent) 1 (word form variant) 2 (word equivalent) 4 (equivalent phrase) 4 (equivalent phrase) 4 (equivalent phrase) 4 (equivalent phrase) 2 (word equivalent) The table is used to make substitutions in the search string to produce all possible unique search variants: "Fragmentation of renal calculus" "Fragmentation of renal stone" "Fragmentation of kidney stone" "Fragmentation of kidney calculus" "Fragmentation of Nephrolith" "Fragmentation of renal calculus" "Fragmentation of renal calculi" "Fragmentation of kidney calculi" These 8 search strings are used as the target phrase for keyword searches on the word pair index. Results from all 8 searches are combined, and duplicate concepts are eliminated, giving the final list of search results. 4.4.1.4. Rationalizing searches that return duplicate hits In the previous sections of this guide, we have considered methods of ensuring that searches on a target phrase maximize the possibility of finding the concept that the system user requires. It is equally important to prevent the search results from containing excessive matches, since these will require filtering by the user, imposing an additional burden. Some strategies for limiting the number of search results displayed are discussed below. © 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434
4.4.1.4.1. Avoiding multiple hits on the same concept In many instances several synonyms associated with the same concept contain the same keyword. The designer of search software may consider filtering the output of search results so that only the first matching description for a concept is displayed. Example: "Endoscopic examination of the stomach" and "endoscopy of the stomach" are synonyms of the same concept. A search for the target phrase "endo* stomach" would return the first phrase found during the search. The second would be excluded, since it has the same concept Identifier as an existing match for this search. 4.4.1.4.2. Constraining and extending search parameters User configurable options may be one way of limiting search results. Three possible methods of limiting search results through user configurable options are suggested here: • Limiting searches to exact matches unless wild cards are used. A search on a single word may produce many matches if it is assumed that the user is searching for any phrase that contains the target word. Forcing the use of wild cards for this kind of search can help avoid this problem. • Make searches that include use of " word equivalents" a user configurable option that can be used to extend or constrain a search. • Display search results a few at a time, with most frequently used descriptions listed first. This option will require the application to track the frequency of term selection so that search results can be sorted in this way. 4.4.2. Hierarchical Navigation This section of the guide describes the Terminology services that are likely to be required to navigate SNOMED CT hierarchies. One of the key strengths of SNOMED CT is a rich set of relationships that connect the concepts within the terminology. The primary use of these relationships is to facilitate selective retrieval. However, some of these relationships are arranged in hierarchies that can be navigated using an appropriate user-interface control. For example, the subtype hierarchy formed by the | is a | relationships can be used to navigate from a selected concept to a more or less specific concept. SNOMED CT also specifies ways in which alternative navigation hierarchies can be created. Unlike relationship based hierarchies, navigation hierarchies convey no semantic information but are intended to be used to enhance the user experience when navigating through the terminology. 4.4.2.1. Access to hierarchically related concepts Terminology servers should enable client applications to access collections of Concepts that are related to a specified Concept as: • Subtype children • Subtype descendants (includes all generations of children); • Supertype parents • Supertype ancestors (includes all previous generations of parents). Terminology services Guide (RF1) | 317 © 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
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PartitionId 05 Description A Cross
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SctId 999999990989121104 2.3.2.9. T
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2.3.3.2. Specification for Namespac
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2.3.3.3.1.4. Procedures 2.3.3.3.1.4
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1. Every Concept in an Extension:
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Table 17: Processing Transfers betw
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In May 2008, the HL7 Version 3 Stan
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An expression supports combinations
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digitNonZero= %x31-39 The first cha
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excision of left fallopian tube. No
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This existential restriction is lab
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• In order to generate the OWL ve
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• Though there are many candidate
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2.3.7.2.2.1. Single byte encoding C
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9 0 9 Table 29: The full array for
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else {document.getElementById("out"
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http://www.augustana.ab.ca/~mohrj/a
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version. It seems unwise to prevent
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Table DescDualKey Table ConcDualKey
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The IHTSDO recognizes that, while i
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3.2.2. Release Format 1 - Structure
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3.2.3.2. Core Tables Data - Structu
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Data Fields InitialCapitalStatus De
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3.2.4.1. Subset Mechanism - Structu
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Data Fields ContextId 3.2.4.2.2. Su
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Subset SNOMED CT Top Level Navigati
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• as a combination of codes; •
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Table 41: Cross Mapping Tables Cros
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Table 44: Cross Map Targets Table K
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The History Mechanism is also used
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In addition, the ReferencedId field
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Table Descriptions Descriptions Rel
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Table 49: Relationships depending o
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Table 51: Changes to Relationships
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Table 52: Changes to Relationships
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• The only Relationships that it
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ComponentId ConceptId ReleaseVersio
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A readme.txt file is distributed wi
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Value 6 10 11 Limited Moved elsewhe
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As new concepts are added to SNOMED
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Table 73: DescriptionStatus Values
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3.2.9.2.2.4. InitialCapitalStatus T
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3.2.9.3. relationships tables Each
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3.2.9.3.2.3. ConceptId2 Table 84: -
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An integer value that expresses an
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3.2.9.4.1.2.4. SubsetType Table 95:
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A string that identifies a Context
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3.2.9.4.2.1.2. Data Fields Table 10
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• MemberStatus 3.2.9.4.2.3.1.1. S
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3.2.9.4.2.4.1.3. MemberStatus Table
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3.2.9.4.2.5.2. Data Fields Table 11
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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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Page 267 and 268: 3.2.13. Enumerated values Value 0 1
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Page 285 and 286: descriptions associated with concep
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Page 353 and 354: Cross maps table A data table consi
Page 355 and 356: • References Table Inactive compo
Page 357 and 358: A field in the Cross Maps Table tha
Page 359 and 360: A Subset that specifies sets of Nav
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Page 363 and 364: TargetId A SNOMED CT Identifier tha
Page 365: WordText A field in the Word Equiva
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