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Special attention is to be paid to the possibility of altering the semantics of those concepts whose FSN uniqueness depends upon case significance.
For example,
- The subtypes of 365638007 |Finding of Rh blood group (finding)| vary in meaning depending upon the description's case of the letters c, d, and e.
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| CapId | id-10640 |
|---|---|
| CapType | Figure |
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Figure 1. Stated view of 365638007 |Finding of Rh blood group (finding)|
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and
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subtypes
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Case sensitivity can be changed on an existing description without inactivating the description. |
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| Warning |
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The common name for |Structure of pharyngotympanic tube (body structure)| is eustachian tube. While the term originated eponymously, it is not the name of the person from whom the body structure was named after. Therefore, the case significance is ci for case insensitive. |
Extensions
SNOMED CT includes three case significance values, "ci", "cI" and "CS". However, this range of values depends on the languages and linguistic norms. For the International Edition, where the first character of descriptions is always capitalized, the value "Only initial character case insensitive" ("cI") is necessary. This value is not required for descriptions in extensions that do not adhere to this convention. When appropriate, it is also acceptable to limit the range to a single case significance value.
Numeric values
Numeric values will not display differently if switched between upper and lower case, so numeric values should be treated as case insensitive characters in a term.
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- The concept
has the synonym, 6-TG. Apply the case sensitivity indicator of cl for Only initial character case insensitive.Concept t 387407006 |Tioguanine (substance)|
Special characters
Special characters such as <, %, >, . , &, ^, will not display differently if switched between upper and lower case, so numeric values should be treated as case insensitive characters in a term. The rules for numeric values apply similarly to special characters.
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Words derived from the Greek alphabet, for example, alpha, beta, delta, gamma, omega, etc., are case insensitive wherever they are in the description in the substance hierarchy. |
Assessment scales and Staging systems
SNOMED CT descriptions representing assessment scales and staging systems should be capitalized per the name of the scale or staging system. Legacy concepts may not follow this pattern.
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