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Interactions with the Terminology Service

Determining the proper code, system and unit for Quantity

Given an observation codeand corresponding system from the ValueSet ehealth-observation-codes, how does one then determine how to specify an observed quantity or reference range? The following describes how to obtain values to set inQuantity.code, .system and .unit.

To get values forQuantity.codeandQuantity.system use the ConceptMap conceptmap-obs-code-to-ucum as follows:

  1. Call $translate on the given code and system:

    1. GET <base-url>/fhir/ConceptMap/$translate?system=<system>&code=<code>

  2. On match found, the values to use in Quantity.codeandQuantity.systemare the matching concept’s code and system, respectively, where the source ConceptMap is “http://ehealth.sundhed.dk/ConceptMap/conceptmap-obs-code-to-ucum” (see example response below):

Example request and response on $translate on conceptmap-obs-code-to-ucum

Request:

GET <base-url>/fhir/ConceptMap/$translate?system=urn:oid:1.2.208.176.2.1&code=NPU03804

Response:

{     "resourceType": "Parameters",     "parameter": [         {             "name": "result",             "valueBoolean": true         },         {             "name": "message",             "valueString": "Matches found!"         },         {             "name": "match",             "part": [                 {                     "name": "equivalence",                     "valueCode": "specializes"                 },                 {                     "name": "concept",                     "valueCoding": {                         "system": "http://unitsofmeasure.org",                         "code": "kg",                         "display": "kilogram"                     }                 },                 {                     "name": "source",                     "valueUri": "http://ehealth.sundhed.dk/ConceptMap/conceptmap-obs-code-to-ucum"                 }             ]         }     ] }

To get the corresponding and printable value for Quantity.unit, use the ConceptMap conceptmap-ucum-to-printsymbol as follows:

  1. Call $translate on the given system and code determined in the response above:

    1. GET <base-url>/fhir/ConceptMap/$translate?target=http://ehealth.sundhed.dk/vs/ehealth-ucum-printsymbol-supplement&code=<code>&system=<system>

  2. On match found, extract the matching concept (see example response below).

  3. Call $lookupon the matching (CodeSystem) system and code:

    1. GET <base-url>/fhir/CodeSystem/$lookup?system=http://ehealth.sundhed.dk/cs/ehealth-ucum-printsymbol-supplement&code=<code>

  4. On match found, the value to use in Quantity.unitis the matching concept’s designation.valuewhere the designation.language=da(see example response below). If there is no such designation, the printable value in Quantity.unit shall be left empty.

The $lookup does not return designation on eHealth Infrastructure Release 4 and other releases prior to Release 5.

Example request and response on $translate on conceptmap-ucum-to-printsymbol

Request (Note that URL-encoding of percent as code is used):

GET <base-url>/fhir/ConceptMap/$translate?target=http://ehealth.sundhed.dk/vs/ehealth-ucum-printsymbol-supplement&code=%25&system=http://unitsofmeasure.org

Response:

{     "resourceType": "Parameters",     "parameter": [         {             "name": "result",             "valueBoolean": true         },         {             "name": "message",             "valueString": "Matches found!"         },         {             "name": "match",             "part": [                 {                     "name": "equivalence",                     "valueCode": "specializes"                 },                 {                     "name": "concept",                     "valueCoding": {                         "system": "http://ehealth.sundhed.dk/cs/ehealth-ucum-printsymbol-supplement",                         "code": "%",                         "display": "percent"                     }                 },                 {                     "name": "source",                     "valueUri": "http://ehealth.sundhed.dk/ConceptMap/conceptmap-ucum-to-printsymbol"                 }             ]         }     ] }

Example request and response on $lookup on ehealth-ucum-printsymbol-supplement

Request (Note that URL-encoding of percent as code is used):

GET <base-url>/fhir/CodeSystem/$lookup?system=http://ehealth.sundhed.dk/cs/ehealth-ucum-printsymbol-supplement&code=%25

Response:

{     "resourceType": "Parameters",     "parameter": [         {             "name": "name",             "valueString": "UCUMPrintSymbolSupplement"         },         {             "name": "version",             "valueString": "0.6.0"         },         {             "name": "display",             "valueString": "percent"         },         {             "name": "abstract",             "valueBoolean": false         },         {             "name": "designation",             "part": [                 {                     "name": "language",                     "valueCode": "da"                 },                 {                     "name": "use"                 },                 {                     "name": "value",                     "valueString": "%"                 }             ]         }     ] }

Determining whether to provide measurement as integer or decimal

Given an observation codeand corresponding system from the ValueSet ehealth-observation-codes, how does one determine whether an observed quantity or reference range shall be stated as an integer or decimal? While a particular device might produce a decimal with a given precision for a measure, it is up to the client/solution to convert to the form expected by the infrastructure. Whether integer or decimal, the value is set inQuantity.value.

To determine whether to use integer or decimal, use the ConceptMap conceptmap-obs-code-to-value-type as follows:

  1. Call $translate on the given code and system:

    1. GET <base-url>/fhir/ConceptMap/$translate?system=<system>&code=<code>&target=http://hl7.org/fhir/ValueSet/data-types

  2. On match found, indication of whether to use integer or decimal are the matching concept’s code and system, respectively, where the source ConceptMap is “http://ehealth.sundhed.dk/ConceptMap/conceptmap-obs-code-to-value-type” (see example response below).

  3. The codes integer and decimal in system http://hl7.org/fhir/data-types signify that the observed value or reference range shall be given as integer and decimal, respectively.

Example request and response on $translate on conceptmap-obs-code-to-value-type

Request:

GET <base-url>/fhir/ConceptMap/$translate?system=urn:oid:1.2.208.176.2.1&code=NPU03804&target=http://hl7.org/fhir/ValueSet/data-types

Response:

{
    "resourceType": "Parameters",
    "parameter": [
        {
            "name": "result",
            "valueBoolean": true
        },
        {
            "name": "message",
            "valueString": "Matches found!"
        },
        {
            "name": "match",
            "part": [
                {
                    "name": "equivalence",
                    "valueCode": "specializes"
                },
                {
                    "name": "concept",
                    "valueCoding": {
                        "system": "http://hl7.org/fhir/data-types",
                        "code": "decimal",
                        "display": "decimal"
                    }
                },
                {
                    "name": "source",
                    "valueUri": "http://ehealth.sundhed.dk/ConceptMap/conceptmap-obs-code-to-value-type"
                }
            ]
        }
    ]
}

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