An Identifier in a C-GET request shall contain:
the Query/Retrieve Level (0008,0052) which defines the level of the retrieval
Specific Character Set (0008,0005) shall be present if Patient ID (0010,0020) is using a character set other than the default character repertoire.
The Unique Keys at each level of the hierarchy and the values allowable for the level of the retrieval shall be defined in the SOP Class definition for the Query/Retrieve Information Model.
Note: In the Baseline behavior, more than one entity may be retrieved if the Query/Retrieve Level is IMAGE, SERIES or STUDY, using List of UID matching, but only Single Value Matching value may be specified for Patient ID (0010,0020).