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Source1

{
  "resourceType": "CodeSystem",
  "id": "lab-test-local-cs",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "url": "https://hl7.eu/fhir/ig/hl7.eu.fhir.protect-child/CodeSystem/lab-test-local",
  "version": "0.1.0-ci-build",
  "name": "LabTestLocalCS",
  "title": "Lab Test Local Codes",
  "status": "draft",
  "experimental": true,
  "date": "2026-06-05T19:23:32+00:00",
  "publisher": "Protect Child",
  "contact": [
    {
      "name": "Protect Child",
      "telecom": [
        {
          "system": "url",
          "value": "https://protect-child.eu/"
        }
      ]
    }
  ],
  "description": "Local codes for laboratory tests that do not have a single unambiguous LOINC code in the PROTECT-CHILD context (e.g., calculated values or composite measures).",
  "caseSensitive": true,
  "content": "complete",
  "count": 6,
  "concept": [
    {
      "code": "creatinine-egfr",
      "display": "Creatinine eGFR",
      "definition": "Estimated GFR calculated from serum creatinine (formula specified in Observation extension gfr_formula)."
    },
    {
      "code": "cystatinc-egfr",
      "display": "Cystatin C eGFR",
      "definition": "Estimated GFR calculated from Cystatin C (formula specified in Observation extension gfr_cyst_formula)."
    },
    {
      "code": "indirect-bilirubin",
      "display": "Indirect Bilirubin",
      "definition": "Indirect (unconjugated) bilirubin — calculated as total minus direct."
    },
    {
      "code": "proteinuria-creatininuria-ratio",
      "display": "Proteinuria/creatininuria ratio",
      "definition": "Urine protein-to-creatinine ratio."
    },
    {
      "code": "prothrombin-activity",
      "display": "Prothrombin Activity",
      "definition": "Prothrombin activity (%). Distinct from prothrombin time (seconds/INR)."
    },
    {
      "code": "urine-microscopic-hematuria",
      "display": "Urine microscopic hematuria",
      "definition": "Microscopic hematuria on urine sediment examination."
    }
  ]
}