SNOMED CT Editorial Guide

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Previously, SNOMED CT represented ions and electrolytes as separate concepts. Although the two terms are subtly different, there is considerable overlap in their definitions, and they seem to be used interchangeably in medicine. The Substances Redesign Project Group has considered this issue and determined the following:

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  • A second parent (in addition to X (substance)), that indicates the concept is an ionized substance, should be modeled. 
    • Use a descendant of 86355000 |Electrolyte (substance)| as the additional parent.  (86355000 <<86355000 |Electrolyte (substance)| and its children are used in LOINC term expression associations.)
  • Non-Ionized/Non-Ionised substances should not be created.

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Modeling 

Parent concepts

Most distal appropriate descendant of  86355000 | Electrolyte (substance)|

Most distal appropriate descendant of 312413002 |Substance categorized structurally (substance)|

Semantic tag

(substance)

Definition status
900000000000074008 |Necessary but not sufficient concept definition status (core metadata concept)|

Primitive

Attribute

none

None

Naming

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FSN

Pattern:

  • X ion (substance) 

For example,

      • Ferric ion (substance)

Preferred Term

Pattern:

  • X ion

For example,

      • Ferric ion

Synonyms

Pattern:"Ionized X" and "X electrolyte"

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Add "Ionised X" as GB synonym.

For example,

      • Ionised fluorine
      • Ionized fluorine
      • Fluoride electrolyte
Where an element can exist with more than one level of oxidation, for example, iron can exist in either the ferric (Fe3+) or ferrous (Fe 2+) ionization states, the synonyms "Ionised X" and "Ionized X" should not be added since they are ambiguous.

Exemplar

The following illustrates the Stated and Inferred view:

Image Modified


The following illustrates the the hierarchy view:

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