{
  "resourceType": "Questionnaire",
  "status": "active",
  "item": [
    {
      "linkId": "phq2",
      "text": "PHQ-2 Depression Screening",
      "type": "group",
      "item": [
        {
          "linkId": "phq2-intro",
          "text": "Over the last 2 weeks, how often have you been bothered by any of the following problems?",
          "type": "display"
        },
        {
          "linkId": "phq2-q1",
          "code": [
            {
              "system": "http://loinc.org",
              "code": "44250-9"
            }
          ],
          "text": "Little interest or pleasure in doing things",
          "type": "choice",
          "extension": [
            {
              "url": "http://hl7.org/fhir/StructureDefinition/questionnaire-itemControl",
              "valueCodeableConcept": {
                "coding": [
                  {
                    "system": "http://hl7.org/fhir/questionnaire-item-control",
                    "code": "radio-button"
                  }
                ]
              }
            }
          ],
          "required": true,
          "answerOption": [
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 0
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6568-5",
                "display": "Not at all"
              }
            },
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 1
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6569-3",
                "display": "Several days"
              }
            },
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 2
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6570-1",
                "display": "More than half the days"
              }
            },
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 3
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6571-9",
                "display": "Nearly every day"
              }
            }
          ]
        },
        {
          "linkId": "phq2-q2",
          "code": [
            {
              "system": "http://loinc.org",
              "code": "44255-8"
            }
          ],
          "text": "Feeling down, depressed, or hopeless",
          "type": "choice",
          "extension": [
            {
              "url": "http://hl7.org/fhir/StructureDefinition/questionnaire-itemControl",
              "valueCodeableConcept": {
                "coding": [
                  {
                    "system": "http://hl7.org/fhir/questionnaire-item-control",
                    "code": "radio-button"
                  }
                ]
              }
            }
          ],
          "required": true,
          "answerOption": [
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 0
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6568-5",
                "display": "Not at all"
              }
            },
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 1
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6569-3",
                "display": "Several days"
              }
            },
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 2
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6570-1",
                "display": "More than half the days"
              }
            },
            {
              "extension": [
                {
                  "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
                  "valueDecimal": 3
                }
              ],
              "valueCoding": {
                "system": "http://loinc.org",
                "code": "LA6571-9",
                "display": "Nearly every day"
              }
            }
          ]
        },
        {
          "linkId": "phq2-total",
          "code": [
            {
              "system": "http://loinc.org",
              "code": "55758-7"
            }
          ],
          "text": "PHQ-2 total score",
          "type": "decimal",
          "readOnly": true,
          "extension": [
            {
              "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-calculatedExpression",
              "valueExpression": {
                "language": "text/fhirpath",
                "expression": "iif(%resource.repeat(item).where(linkId in ('phq2-q1' | 'phq2-q2')).answer.valueCoding.extension('http://hl7.org/fhir/StructureDefinition/ordinalValue').valueDecimal.count() = 2, %resource.repeat(item).where(linkId in ('phq2-q1' | 'phq2-q2')).answer.valueCoding.extension('http://hl7.org/fhir/StructureDefinition/ordinalValue').valueDecimal.sum(), {})"
              }
            }
          ]
        },
        {
          "linkId": "phq2-result",
          "text": "Screening result",
          "type": "string",
          "readOnly": true,
          "extension": [
            {
              "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-calculatedExpression",
              "valueExpression": {
                "language": "text/fhirpath",
                "expression": "iif(%resource.repeat(item).where(linkId='phq2-total').answer.valueDecimal.exists(), iif(%resource.repeat(item).where(linkId='phq2-total').answer.valueDecimal < 3, 'Negative screen', 'Positive screen — follow up with the PHQ-9'), {})"
              }
            }
          ]
        }
      ]
    }
  ]
}