Interoperability in modern healthcare relies on HL7 FHIR standards. This tutorial outlines how to compile parsed OCR parameters into queryable Observation bundles.

Mapping Text to Codes

Before writing to FHIR, raw text values must match standardized vocabularies:

Medications -> **RxNorm**

Lab Results -> **LOINC**

Diagnoses -> **SNOMED CT**

Constructing the Observation Resource

A typical blood sodium observation resource is compiled as follows:

snippet.json

{
  "resourceType": "Observation",
  "status": "final",
  "code": {
    "coding": [
      {
        "system": "http://loinc.org",
        "code": "2951-2",
        "display": "Sodium [Serum/Plasma]"
      }
    ]
  },
  "valueQuantity": {
    "value": 138,
    "unit": "mmol/L"
  }
}

This resource is then bundled and written to the EHR via SMART on FHIR write APIs.

Interoperability in modern healthcare relies on HL7 FHIR standards. This tutorial outlines how to compile parsed OCR parameters into queryable Observation bundles.

Mapping Text to Codes

Before writing to FHIR, raw text values must match standardized vocabularies:

Medications -> **RxNorm**

Lab Results -> **LOINC**

Diagnoses -> **SNOMED CT**

Constructing the Observation Resource

A typical blood sodium observation resource is compiled as follows:

snippet.json

{
  "resourceType": "Observation",
  "status": "final",
  "code": {
    "coding": [
      {
        "system": "http://loinc.org",
        "code": "2951-2",
        "display": "Sodium [Serum/Plasma]"
      }
    ]
  },
  "valueQuantity": {
    "value": 138,
    "unit": "mmol/L"
  }
}

This resource is then bundled and written to the EHR via SMART on FHIR write APIs.

Mapping Scanned Referrals to FHIR Observations

Mapping Text to Codes

Constructing the Observation Resource

Mapping Scanned Referrals to FHIR Observations

Mapping Text to Codes

Constructing the Observation Resource