PHQ-9 Item Example 44251-7: FHIR TTL Representation
PHQ9 Item Example 44251-7 - TTL Representation - iEHR
Summary
This article demonstrates how a specific observation data point (LOINC: 44251-7) from the PHQ-9 screening tool is structured using the FHIR standard in TTL format. It details the representation of an item concerning 'Poor appetite or overeating,' showing how patient information, performer, and measured values are standardized for clinical data exchange.
Details
This document serves as a technical specification within the IE (Ireland) Core Implementation Guide, demonstrating the use of the FHIR Observation resource to represent a specific question from the PHQ-9 screening tool. Specifically, it defines an observation titled 'Poor appetite or overeating in last 2 weeks,' complete with metadata such as patient name, effective date, and performer. The example utilizes the structured description (`fhir:text`) of the Observation resource to ensure that the data is not merely text but includes standardized semantic components like categories (Survey, Disability Status), code systems (LOINC 44251-7), and measured values (LA6569-3). This structure provides a foundation for accurately exchanging complex clinical data, such as mental health assessments, between electronic health records and various medical information systems. The use of FHIR's TTL format presents resource definitions in a machine-readable yet human-understandable way, contributing to international data standardization. The guide specifies how to handle data in a concrete manner based on a specific medical profile (IE Core Observation Screening Assessment Profile), illustrating best practices for clinical data handling.
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