A 128-bit integer used to uniquely identify information in computer systems.

Universally unique identifier are generated by widely available algorithms. They are used to identify information in computer systems world-wide.
In SNOMED CT universally unique identifiers is used to uniquely identify . Since universally unique identifiers are unique and it is unnecessary to track the issuing of identifiers for the thousands of that are needed in some implementations.
In , universally unique identifiers are represented as a string following a standard - a 36 character string containing 32 hexadecimal digits and four hyphens. The hexadecimal digits are arranged in five groups separated by the hyphens. The first group contains 8 hexadecimal digits, the last group contains 12 and each of the three other groups contains 4. So the overall pattern is 8-4-4-4-12.

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