...

	^ *

Alternate Identifier

If an alternate identifier exists for a concept, in an identifier scheme other than SNOMED CT, then this can be used to refer to that concept

 (see 4.2.4 Identifier File Specification). For example there may be SNOMED CT concept for "Type of hemoglobin in blood at point in time" with an alternate identifier with the scheme alias "LOINC" and the code "54486-6":

	LOINC#54486-6

The alternate identifier code can be surrounded by quotes.

The alternate identifier code can be surrounded by quotes.

The alternate identifier code can be surrounded by double quotes. Quoting may be necessary to ensure correct parsing of the constraint depending on the characters used in the code:

	LOINC#"54486-6"

Please note: ECL is always evaluated against SNOMED CT concepts. When you run a query using alternate identifiers from another code system only concepts that are in the SNOMED CT representation of that other code system will be returned. For example the descendants of a concept in the SNOMED CT version of a code system is likely to be different from the code system of the alternate identifier.