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

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314 | SNOMED CT Release Format 1 (RF1) Guide July 2012 Dual key TOTUSE ConceptId 19954002 4.4.1.2.2. Searching for Descriptions using the DualKey index A search on the dual key index can only be carried out if the user enters a search string that contains at least two word fragments both of which are three characters or more in length. If the search string does not meet this criterion, the single keyword search mechanism must be used. • The user-typed search string is converted to consistent case; • The string is parsed, breaking at spaces and punctuation characters; • For each word of three characters or more, extract the first 3 characters, and arrange the word fragments in alphabetical order; • Create a dual key by concatenating the first two 3 letter word fragments; • Use this dual key to look up exact matches on the word pair index; • Descriptions found by searching on the word pair index are screened, to see if they contain the complete words in the original search string 4.4.1.2.2.1. Example: Search using word pair index User searches for "PYRO* 1 OXYGEN*". • The string is parsed, breaking at spaces and punctuation characters. 1. "PYRO*"; 2. 1; 3. "OXYGEN*". • For each word of three characters or more, extract the first 3 characters, and arrange the word fragments in alphabetical order. 1. "OXY"; 2. "PYR". • Create a dual key by concatenating the first two 3 letter word fragments. OXYPYR • Use this dual key to look up exact matches on the word pair index. Table 245: Sample results of a search for "PYRO* 1 OXYGEN*" Dual key OXYPYR OXYPYR OXYPRY DescriptionId 1969019 22565018 104951019 Description | o-Pyrocatechuate oxygenase | | pyrogallol 1,2-oxygenase | | 2,5-Dihydroxy-pyridine oxygenase | • Descriptions found by searching on the word pair index are screened, to see if they contain the complete words in the original search string : • Description 1969019 is eliminated since it does not contain the word "1"; © 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434
• Description104951019 is eliminated, it does not contain the word "1" or any word beginning with the string "pyro". 4.4.1.3. Using word equivalents to enhance searches In healthcare, there are many words with equivalent meanings. Synonyms provide alternative phrases referring to the concept. However, synonyms are not created automatically for every possible combination of words with an equivalent meaning. The success of simple searches using one or more keywords depends on the text of the available descriptions.Therefore searches will fail or will be incomplete where a different equivalent word is used in the search. For example: "Kidney stone" and "Renal calculus" are synonymous descriptions in SNOMED CT. A search of SNOMED CT for the target phrase "kidney stone fragmentation" yields the result "Percutaneous nephrostomy with fragmentation of kidney stone," while a search for "Renal stone fragmentation" yields no results. One way of addressing this problem is to maintain a table of word equivalents. A table of this type is a prerequisite for exhaustive synonym generation. An initial set of word equivalents is included in the SNOMED CT Developer Toolkit. Individual implementers will wish to add additional word equivalents to meet the requirements of their particular medical specialty or user needs. This table is an additional resource to assist searching and parsing of phrases. It need not be a comprehensive dictionary of words. Many searches can be completed without reference to this table so it need not contain every word or equivalent phrase used in SNOMED CT. Several factors complicate the initial population and subsequent use of the word equivalents table: • A phrase of two or more words may be equivalent to a single word. Example: "Endoscopic esophagus examination" is equivalent to "esophagoscopy" • A word may have more than one meaning, and in this, only one meaning of a pair of words may be equivalent. Thus an apparent enhancement of a search may in practice lose some of the specificity of the intended search. Example: "Tap" and "aspiration" are equivalent in the context of terms such as "pleural tap", "pleural aspiration", but not in the context of a "patella tap", a physical "tap" on a bag or catheter, or the clinical disorder "neonatal aspiration syndrome." • When searching using incomplete words and/or wildcards, use of word equivalents may impede effective searches by increasing the number of spurious potential matches. This either extends the processing required to filter the real matches from the potential matches or increases the length of the list of choices presented to the user. A wise system developer will allow the user to customize their search options, enabling searches to be narrowed, or extended to meet the needs of varying circumstances. 4.4.1.3.1. Example: Using word equivalents table to extend a failed search A system user enters the search string "Fragmentation of renal calculus;" the search returns no results. The search application that the user has been provided with has the option to extend the search by using the word equivalents table. The user selects this option and searches again using the same search string. The word equivalents table contains the following relevant entries: Terminology services Guide (RF1) | 315 © 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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Page 267 and 268: 3.2.13. Enumerated values Value 0 1
Page 269 and 270: Table and Field Subsets SubsetType
Page 271 and 272: 3.3. Release Format 2 Update Guide
Page 273 and 274: • The Release Format should minim
Page 275 and 276: 3.3.3.4. Backward compatibility The
Page 277 and 278: 3.3.4.5. Field Ordering Records in
Page 279 and 280: externalised structures such as Ref
Page 281 and 282: ContextId If either the RealmId fie
Page 283 and 284: eplaced by more descriptive ones if
Page 285 and 286: descriptions associated with concep
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Page 289 and 290: was inactivated. Each Reference ind
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Page 317 and 318: 4.4.1.4.1. Avoiding multiple hits o
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Page 329 and 330: • 302402006 | radius and/or ulna
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Page 335 and 336: • One Subset can be used as the b
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Page 341 and 342: • A RealmID identifies the specia
Page 343 and 344: 4.5. Testing and traversing subtype
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Page 347 and 348: 4.5.5.2.4. Using the transitive clo
Page 349 and 350: Figure 55: Terminology server provi
Page 351 and 352: A field in the Component History Ta
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
Page 361 and 362: A field in the Concepts Table that
Page 363 and 364: TargetId A SNOMED CT Identifier tha
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WordText A field in the Word Equiva
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