HL7 DSC Continuation Pointer
HL7 field reference DSC fields from HL7 v2.5.1 Show fields
DSC carries the continuation pointer used when a query response or large logical result set is split across more than one message.
Query segments define what the sender is asking for, how the receiver should format the answer, and how a multi-message response is continued or limited.
A query is an interface contract. The tag, parameters, row definitions, sort/filter rules, and continuation pointers must match exactly or the receiver may return technically valid data that is not what the requester expected.
The v2.5.1 structures show DSC in ADR_A19 - Patient query, DOC_T12 - Document query, DSR_Q01 - Query sent for immediate response, and DSR_Q03 - Deferred response to a query, and 53 other message structures. That tells you where it can appear, but the implementation guide still decides which optional fields are meaningful.
For practical interface work, read the generated field panel for datatype, required, repeatable, and table details, then use the notes below to decide what the field should mean in the receiving workflow.
DSC-1 is the token used to request or send the next part of a multi-message response. Treat it as opaque unless the profile says otherwise; the receiver that issued it owns its meaning.
DSC-2 carries Continuation Style for this query workflow. Populate it only when the receiver has a clear use for it, and keep the value in the datatype shape shown in the generated field panel.
The generated panel links this to HL7 table 0398; many real interfaces narrow that list further, so follow the receiver's implementation guide.