documentation:vocabulary:ucum
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documentation:vocabulary:ucum [2016/06/13 11:53] cgreich created |
documentation:vocabulary:ucum [2016/06/14 09:37] (current) cgreich |
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| The basic rules are described here: | The basic rules are described here: | ||
| - | * All units are derived from unit atoms, which are either proper units (e.g. centimeter, inch) or arbitrary units (depending on the method of measurement (international units). | + | * All units are derived from unit atoms, which are either proper units (e.g. centimeter, inch) or arbitrary units, which depend on the method of measurement (e.g. international units). |
| - | * Square brackets ("[" and "]") depict unit atoms (e.g. [U], [drop], [yd_us] - yard US, [tb'U] - tuberculin unit), or annotations to units that make them new unit atoms (like mm[Hg]) | + | * Square brackets ("[" and "]") depict unit atoms (e.g. [U], [drop], [yd_us] - yard US, [tb'U] - tuberculin unit), or annotations to units that make them new unit atoms (e.g. mm[Hg]) |
| * Curly braces ("{" and "}") contain annotations that are traditionally used in clinical labs (e.g. mg{creat} - mg creatinine, {RBC}/uL - red blood cells per microliter). Any annotation in curly braces can be omitted without changing the meaning of the unit. | * Curly braces ("{" and "}") contain annotations that are traditionally used in clinical labs (e.g. mg{creat} - mg creatinine, {RBC}/uL - red blood cells per microliter). Any annotation in curly braces can be omitted without changing the meaning of the unit. | ||
| ==== Transformation ===== | ==== Transformation ===== | ||
| - | Since there is no fixed set of UCUM-based units, there is no transformation. All UCUM Concepts are manually curated, and additions can be made on request. | + | Since there is no fixed set of UCUM-based units, there is no transformation. All UCUM Concepts are manually curated, and additions and changes can be made on request. |
| ==== Concept Names ==== | ==== Concept Names ==== | ||
| Line 17: | Line 17: | ||
| ==== Concept Codes ==== | ==== Concept Codes ==== | ||
| - | Concept Codes are not codes in the traditional sense of the OMOP Standardized Vocabulary, where they identify a semantic meaning using within the source vocabulary. Instead, the Concept Codes contain the unit in UCUM notation. | + | Concept Codes are not codes in the traditional sense of the OMOP Standardized Vocabulary, identifying a distinct semantic meaning within the source vocabulary. Instead, the Concept Codes contain the unit in UCUM notation. |
| ==== Standard Concepts ==== | ==== Standard Concepts ==== | ||
| Line 29: | Line 29: | ||
| ==== Concept Relationships ==== | ==== Concept Relationships ==== | ||
| - | There are only mapping relationships from equivalent units in other vocabularies. | + | There are only mapping relationships from equivalent units in other vocabularies. However, these mappings are not yet comprehensive. |
| ==== Hierarchy ==== | ==== Hierarchy ==== | ||
| There is no hierarchical system in UCUM units. | There is no hierarchical system in UCUM units. | ||
documentation/vocabulary/ucum.txt · Last modified: 2016/06/14 09:37 by cgreich
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