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Source1

{
  "resourceType": "CodeSystem",
  "id": "banff-c4d-score-cs",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "url": "https://hl7.eu/fhir/ig/hl7.eu.fhir.protect-child/CodeSystem/banff-c4d-score-cs",
  "version": "0.1.0-ci-build",
  "name": "BanffC4dScoreCS",
  "title": "Banff C4d Score CodeSystem",
  "status": "draft",
  "experimental": true,
  "date": "2026-09-28T06:51:47+00:00",
  "publisher": "Protect Child",
  "contact": [
    {
      "name": "Protect Child",
      "telecom": [
        {
          "system": "url",
          "value": "https://protect-child.eu/"
        }
      ]
    }
  ],
  "description": "Banff C4d score: the extent of C4d staining in peritubular capillaries (kidney) or the portal microvasculature (liver). The DMv1.2 boolean ihc_if_c4d maps to c4d-0 (false) or c4d-1..c4d-3 (true).",
  "caseSensitive": true,
  "content": "complete",
  "count": 4,
  "concept": [
    {
      "code": "c4d-0",
      "display": "C4d0 – negative (0%)",
      "definition": "No C4d staining (Banff C4d0, negative): 0% of peritubular capillaries (kidney) or portal tracts (liver)."
    },
    {
      "code": "c4d-1",
      "display": "C4d1 – minimal (<10%)",
      "definition": "Minimal C4d staining (Banff C4d1): under 10% of peritubular capillaries (kidney) or portal tracts (liver)."
    },
    {
      "code": "c4d-2",
      "display": "C4d2 – focal (10–50%)",
      "definition": "Focal C4d staining (Banff C4d2): 10–50% of peritubular capillaries (kidney) or portal tracts (liver)."
    },
    {
      "code": "c4d-3",
      "display": "C4d3 – diffuse (>50%)",
      "definition": "Diffuse C4d staining (Banff C4d3): over 50% of peritubular capillaries (kidney) or portal tracts (liver)."
    }
  ]
}