MII IG PRO
2027.0.0-ballot.1 - Germany

This page is part of the MII Implementation Guide PRO (v2027.0.0-ballot.1: 2027 Ballot 5) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

PC-PTSD

Clinical Context

The PC-PTSD (Primary Care PTSD Screen) is a brief screen for post-traumatic stress disorder in primary care. Four yes/no questions cover the core domains of re-experiencing, avoidance, hyperarousal and emotional numbing — with reference to a distressing event previously experienced.

Scoring and interpretation (sum score 0–4): each "yes" answer counts one point. A score of three or more is commonly treated as positive and warrants further diagnostic work-up.

Important distinction: the four-item version is represented here, as collected in PCOR-MII. It must be distinguished from the newer PC-PTSD-5 for DSM-5 with five items, for which LOINC carries its own codes (102010-6, LP436025-3). The two are separate instruments and must not be conflated.

FHIR Implementation

Language strategy: German as the primary language. The original is English (Prins et al. 2003), but the verbatim English item text was not available with evidence — therefore no English version is claimed or invented. The German texts come from the PCOR-MII Item Level Dictionary (validated version, Schäfer & Schulze 2010).

Questionnaire

Canonical URL: https://www.medizininformatik-initiative.de/fhir/ext/modul-pro/Questionnaire/mii-qst-pro-pc-ptsd

Capabilities: Displayable, Collectable, Calculatable, Extractable, Domain-aligned

Implementation notes:

  • linkIds pc-ptsd-q01…pc-ptsd-q04, score item pc-ptsd-score-total.
  • An introductory display item carries the stem that applies to all four questions (reference to the distressing event and the four-week recall period).
  • Answers via the shared RuleSet YesNoAnswerOptions with SNOMED CT 373067005/373066001, weights 0/1.
  • Score calculation via FHIRPath: %resource.item.where(linkId.matches('^pc-ptsd-q0[1-4]$')).answer.value.weight().sum().
  • No LOINC or SNOMED code exists for the four-item version (the available LOINC codes concern the PC-PTSD-5); coding is via the MII questionnaire catalogue.

The complete resource: Questionnaire definition.

Score Representation

  1. Calculated item in the QuestionnaireResponse (linkId: pc-ptsd-score-total)
  2. Observation carrying the MII score code pc-ptsd-total
  3. ObservationDefinition: mii-obsdef-pro-score-pc-ptsd — value range 0–4 {score}, higher = stronger suspicion of post-traumatic stress disorder

The cut-off is documented as a qualifiedInterval, not shipped as executable interpretation logic (see Scoring).

License

Freely available per the PCOR-MII DIZ implementation list.

Sources

  • Prins A, Ouimette P, Kimerling R, et al. The Primary Care PTSD Screen (PC-PTSD): development and operating characteristics. Primary Care Psychiatry 2003;9(1):9–14.
  • Schäfer I, Schulze C. Deutsche Version des Primary Care PTSD Screen. 2010. (German version, source of the item texts used here)