IHE-PDQ

IHE PDQ patient demographics query healthcare profile.

Definition

IHE PDQ architecture: (1) Patient Demographics Supplier: server (often a Master Patient Index MPI implementation) that responds to demographic queries returning patient records matching criteria. (2) Patient Demographics Consumer: client (EHR, kiosk, registration desk system) that submits demographic queries when registering or looking up patient. (3) Transactions: ITI-21 Patient Demographics Query (Consumer -> Supplier), ITI-22 Patient Demographics + Visit Query (extended variant including visit/encounter information), ITI-78 Patient Demographics Query for Mobile FHIR-based version. (4) Transport: HL7 v2 messaging (QBP^Q22 query, RSP^K22 response) OR HL7 v3 PRPA_IN201305UV02 etc., FHIR PDQm uses FHIR R4 Patient resource search. (5) Query criteria: last name + first name + DOB + gender + address + phone + SSN partial + multiple combinations (server-side fuzzy matching to handle typos/variations). (6) Response: ranked list of candidate patient records (often up to top 25 matches, with confidence scores), Consumer presents to user for selection. (7) Use cases: Hospital registration desk looks up patient before creating new chart (avoid duplicates), ED registration urgent patient lookup, HIE consumer searching for patient cross-network, immunization registries lookup. IHE PDQ published 2003, multiple revisions, PDQm FHIR-based added ~2015.

Origin

IHE PDQ profile published 2003 by IHE ITI ; PDQm FHIR-based ~2015 ; foundational MPI + registration workflows.

Example in context

Emergency Department registration desk: new ER arrival, registrar types patient demographics 'Smith John DOB 1980-01-15 NY' into Epic ; Epic submits PDQ query to enterprise MPI ; MPI returns ranked list 3 candidate matches with scores ; registrar confirms patient identity + selects existing chart (avoiding duplicate), Epic loads existing patient record into ED workflow.

Related terms

• IHE PIX — complementary cross-reference.