Creating and Maintaining Questionnaire

Questionnaire are created and updated through Questionnaire Create and Questionnaire Update, respectively.

Preparing a Questionnaire for Infrastructure Rule Use

When a question in Questionnaire.item is eligible for extraction in a rule, a DefinedQuestion shall be either found or created and subsequently referenced in Questionnaire.item.definition.

The Questionnaire.item.definition shall be a business versioned reference on the form url|(business) version.

An example:

Preparing a Questionnaire with Embedded, Simple Calculations

A Questionnaire defined with the eHealth profile ehealth-questionnaire-advanced (see https://docs.ehealth.sundhed.dk/latest-released/ig/StructureDefinition-ehealth-questionnaire-advanced.html) can contain zero, one or more expressions performing a calculation based on answers to questions in the Questionnaire. The expression can make use of zero, one or more variables which identify the particular question/answers more concisely.

Defining a Variable

A variable intended for use in an expression (see below) is defined using the extension variable. An example of a variable is shown below as an excerpt of a Questionnaire (in profile ehealth-questionnaire-advanced) in JSON:

 {
  "url": "http://hl7.org/fhir/StructureDefinition/variable",
  "valueExpression": {
    "name": "Count",
    "language": "text/fhirpath",
    "expression": "QuestionnaireResponse.repeat(item).where(linkId='1.2.208.176.1.5.1,7a481674-9016-46bb-8dd8-2ee49f5bbd53,Sundhedsdatastyrelsen').answer.valueInteger"
  }
}

The variable here is defined at Questionnaire root level referencing a particular question through its Questionnaire.item.linkId. On evaluation in a QuestionnaireResponse, the variable will hold the integer value of the answer (presumably, the referenced Questionnaire.item has integer answer type).

An example of a variable evaluating to an ordinal value is shown below as an excerpt of a Questionnaire (in profile ehealth-questionnaire-advanced) in JSON:

 {
  "url": "http://hl7.org/fhir/StructureDefinition/variable",
  "valueExpression": {
    "name": "BreathingDifficulty",
    "language": "text/fhirpath",
    "expression": "iif(QuestionnaireResponse.repeat(item).where(linkId='1.2.208.176.1.5.1,6e6bb131-debd-4675-803b-7d783a75acc6,Sundhedsdatastyrelsen').answer.valueString = 'Severe', 2,
                   iif(QuestionnaireResponse.repeat(item).where(linkId='1.2.208.176.1.5.1,6e6bb131-debd-4675-803b-7d783a75acc6,Sundhedsdatastyrelsen').answer.valueString = 'Normal', 1, {}))"
  }
}

The expression above relies on the definer to ensure consistency between the actual answer values (in Questionnaire.item.answerOption.value[x]) and ordinal values possibly assigned in Questionnaire.item.answerOption.ordinalValue.

Defining a Calculation Expression

An expression is defined in a separate Questionnaire.item (or recursively, Questionnaire.item.item) which shall have:

• Questionnaire.item.readOnly set to true

• Questionnaire.item.type set to decimal

The expression itself is defined in the extension sdc-questionnaire-calculatedExpression (see calculatedExpression) which is an Expression FHIR element type containing:

• language - the expression language. The supported language is a subset of FHIRPath described below. The expression language is specified as "text/fhirpath".

• expression - the expression

An example calculation expression is shown below as an excerpt of a Questionnaire (in profile ehealth-questionnaire-advanced) in JSON:

  "extension": [
    {
      "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-calculatedExpression",
      "valueExpression": {
        "language": "text/fhirpath",
        "expression": "%Animal * %Count"
      }
    },
    "linkId": "1.2.208.176.1.5.1,25d40dde-f91c-4f11-9477-c6cca71d4178,Sundhedsdatastyrelsen",
    "text": "Total",
    "type": "decimal",
    "required": false,
    "readOnly": true
}

Expression Language

The supported expression language is the following subset of FHIRPath:

• Arithmetic: multiplication, division, addition & subtraction only

• Parentheses ‘(' and ')'

• Constants

• The equals operation (=) for primitive types

• The iif function

Releasing a Questionnaire

Once a Questionnaire has been finalized it is eligible for use in PlanDefinition/ActivityDefinition telemedicine packages. Finalizing is performed by setting the Questionnaire status to value active through a Questionnaire Update.

Retiring a Questionnaire

Retire a Questionnaire by setting the Questionnaire status to value retired through a Questionnaire Update.

Managing Defined Questions/Answers

A DefinedQuestion serves multiple purposes:

• Allows for establishing a versioned set of reusable questions, possibly with answer lists, that can be copied when defining Questionnaire resources.

• Enables robust identification of a question in a Questionnaire. By adding the DefinedQuestion elements url and version with a pipe as separator to a particular question through Questionnaire.item.definition as described above, a rule can process a QuestionnaireResponse to the Questionnaire and reliably identify the answer to that question. The QuestionnaireResponse already uses the linkId from the Questionnaire.item.linkId to identify the particular question, but by traversing this link and doing lookup on any Questionnaire.item.definition, a rule can work irrespective of linkId values.

{
    "resourceType": "StructureDefinition",
    "id": "80557",
    "meta": {
        "versionId": "1",
        "lastUpdated": "2020-12-16T09:25:25.068+00:00",
        "profile": [
            "http://ehealth.sundhed.dk/fhir/StructureDefinition/ehealth-definedquestion"
        ]
    },
    "url": "http://ehealth.sundhed.dk/DefinedQuestion/d3db2ad6-b45e-4d21-81db-bcd0ce5d15a3",
    "version": "1",
    "name": "Hvilket af nedenstående udsagn beskriver din situation bedst? \n\nAngiv dit svar:",
    "title": "Hvilket af nedenstående udsagn beskriver din situation bedst? \n\nAngiv dit svar:",
    "status": "active",
    "publisher": "IT Telecare Nord",
    "purpose": "Genbrugeligt spørgsmål til spørgeskema",
    "kind": "logical",
    "abstract": true,
    "type": "StructureDefinition",
    "differential": {
        "element": [
            {
                "id": "StructureDefinition",
                "path": "StructureDefinition.type",
                "definition": "Hvilket af nedenstående udsagn beskriver din situation bedst? \n\nAngiv dit svar:"
            }
        ]
    }
}

Upload an External Questionnaire Definition to the Infrastructure

As described in Prerequisites for document registering of QuestionnaireResponse resources to national document sharing infrastructure, the corresponding questionnaire definition must be available as format Questionnaire Forms Definition Document (QFDD) and accessible to external systems in general. In addition, the QFDD must be available within the eHealth Infrastructure and it must be referenced from a Questionnaire that represents the same definition of the questionnaire.

The steps involved are:

1. Upload the QFDD representation of the questionnaire

2. Associate a Questionnaire with the uploaded QFDD representation

Uploading the QFDD

The QFDD must be represented in a DocumentReference and uploaded to the Document-transformation service by the operation $upload-qfdd.

The requirements for the DocumentReference:

• DocumentReference.status must be current.

• DocumentReference.type must be Coding for QFDD (system = "http://loinc.org" and value = "74468-0").

• DocumentReference.description should contain the title of the questionnaire. If not assigned, the title from the QFDD document is used (in the service operation $upload-qfdd).

• DocumentReference.content.attachment.data must contain the QFDD (as its xml representation).

See https://docs.ehealth.sundhed.dk/latest/ig/OperationDefinition--s-upload-QFDD.html for OperationDefinition.

Associating a Questionnaire with the QFDD

There must be a FHIR Questionnaire that represents the same questionnaire definition as defined in the QFDD.

To associate a Questionnaire with a QFDD, the Questionnaire.identifier must contain the unique document id of the QFDD:

• Identifier.system set to “urn:oid:<Attribute root in /ClinicalDocument/id of the QFDD>"

• Identifier.value set to “<Attribute extension in /ClinicalDocument/id of the QFDD>"

Maintaining Questionnaire Terminology (Danish: Spørgeskemakodebank)

When creating FHIR Questionnaires for the purpose of document sharing, it is required that various questionnaire elements (groups, questions, answers etc.) are configured with coded values and ids.

A coded value used in the questionnaire elements must be maintained as a concept of a CodeSystem in the Questionnaire Terminology Service. The system used for an id (in Identifier.system) must exist as a NamingSystem resource created in the Questionnaire Terminology Service.

The CodeSystem and NamingSystem resources in the Questionnaire Terminology Service can be maintained by users with the Questionnaire Editor role, which has the required permissions.

The Questionnaire Terminology Service is based on the generic Terminology Service and can therefore be interacted with in the same way. Likewise, it is also registered as a standalone FHIR server in the Terminology Administration Application (see https://ehealth-dk.atlassian.net/wiki/spaces/EDTW/pages/2063892483/eHealth+Applications#Terminology-Administration-Application). Administration of questionnaire terminology can be performed in the Terminology Administration Application by choosing the Questionnaire Terminology Service as a backend, as described in the user manual (in Danish, see https://ehealth-dk.atlassian.net/wiki/spaces/EDTW/pages/2063892483/eHealth+Applications#Terminology-Administration-Application).