# Active Surveillance - HL7 Europe Common Cancer Model v1.0.0-ballot

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Active Surveillance**

## Logical Model: Active Surveillance 

| | |
| :--- | :--- |
| *Official URL*:http://hl7.eu/fhir/cancer-common/StructureDefinition/ActiveSurveillance | *Version*:1.0.0-ballot |
| Active as of 2026-06-14 | *Computable Name*:ActiveSurveillance |
| **Copyright/Legal**: HL7 Europe Copyright. Licensed under Common Creative License (CC0 1.0). Details at [Copyright](copyright.md). | |

 
Logical model representing an active surveillance strategy in which the patient is monitored over time without active treatment, prior to disease progression. Derived from Cancer_Common_Logical_Model_20260521.xlsx (sheet ActiveSurveillance). 

**Usages:**

* This Logical Model is not used by any profiles in this Specification

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/resource/hl7.fhir.eu.cancer-common|current/StructureDefinition/StructureDefinition-ActiveSurveillance.json)

### Formal Views of Profile Content

 [Description of Profiles, Differentials, Snapshots and how the different presentations work](http://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#structure-definitions). 

 

Other representations of profile: [CSV](StructureDefinition-ActiveSurveillance.csv), [Excel](StructureDefinition-ActiveSurveillance.xlsx) 



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "ActiveSurveillance",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics",
    "valueCode" : "can-be-target"
  }],
  "url" : "http://hl7.eu/fhir/cancer-common/StructureDefinition/ActiveSurveillance",
  "version" : "1.0.0-ballot",
  "name" : "ActiveSurveillance",
  "title" : "Active Surveillance",
  "status" : "active",
  "date" : "2026-06-14T12:51:40+02:00",
  "publisher" : "HL7 Europe",
  "contact" : [{
    "name" : "HL7 Europe",
    "telecom" : [{
      "system" : "url",
      "value" : "http://hl7.eu"
    }]
  }],
  "description" : "Logical model representing an active surveillance strategy in which the patient is monitored over time without active treatment, prior to disease progression. Derived from Cancer_Common_Logical_Model_20260521.xlsx (sheet ActiveSurveillance).",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "code" : "150",
      "display" : "Europe"
    }]
  }],
  "copyright" : "HL7 Europe Copyright. Licensed under Common Creative License (CC0 1.0). Details at [Copyright](copyright.html).",
  "fhirVersion" : "4.0.1",
  "kind" : "logical",
  "abstract" : false,
  "type" : "http://hl7.eu/fhir/cancer-common/StructureDefinition/ActiveSurveillance",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Base",
  "derivation" : "specialization",
  "differential" : {
    "element" : [{
      "id" : "ActiveSurveillance",
      "path" : "ActiveSurveillance",
      "short" : "Active Surveillance",
      "definition" : "Logical model representing an active surveillance strategy in which the patient is monitored over time without active treatment, prior to disease progression. Derived from Cancer_Common_Logical_Model_20260521.xlsx (sheet ActiveSurveillance).",
      "constraint" : [{
        "key" : "as-1",
        "severity" : "error",
        "human" : "If endDate is present, it must be greater than or equal to startDate.",
        "expression" : "endDate.empty() or endDate >= startDate",
        "source" : "http://hl7.eu/fhir/cancer-common/StructureDefinition/ActiveSurveillance"
      }]
    },
    {
      "id" : "ActiveSurveillance.subject",
      "path" : "ActiveSurveillance.subject",
      "short" : "Subject",
      "definition" : "Reference to the patient (subject) under active surveillance.",
      "min" : 1,
      "max" : "1",
      "type" : [{
        "code" : "http://hl7.eu/fhir/cancer-common/StructureDefinition/CancerPatient"
      }]
    },
    {
      "id" : "ActiveSurveillance.cancerConditionAtDiagnosisReference",
      "path" : "ActiveSurveillance.cancerConditionAtDiagnosisReference",
      "short" : "CancerCondition AtDiagnosis Reference",
      "definition" : "Reference to the cancer condition at diagnosis for which surveillance is applied.",
      "comment" : "The reference to CancerCondition is limited to the CancerConditionAtDiagnosis because ActiveSurveillance is discontinued if a ClinicalCancerProgression occurs, at which point a different treatment strategy is initiated.",
      "min" : 1,
      "max" : "1",
      "type" : [{
        "code" : "Reference",
        "targetProfile" : ["http://hl7.eu/fhir/cancer-common/StructureDefinition/CancerConditionAtDiagnosis"]
      }]
    },
    {
      "id" : "ActiveSurveillance.startDate",
      "path" : "ActiveSurveillance.startDate",
      "short" : "StartDate",
      "definition" : "Start date of the active surveillance period.",
      "min" : 1,
      "max" : "1",
      "type" : [{
        "code" : "dateTime"
      }]
    },
    {
      "id" : "ActiveSurveillance.endDate",
      "path" : "ActiveSurveillance.endDate",
      "short" : "EndDate",
      "definition" : "End date of the active surveillance period (if concluded).",
      "comment" : "It might not be available while the active surveillanceis still ongoing; however, an end date must eventually be recorded.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "dateTime"
      }]
    }]
  }
}

```
