# US Core Vital Signs Profile - US Core Implementation Guide v8.0.1

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **US Core Vital Signs Profile**

## Resource Profile: US Core Vital Signs Profile 

| | | |
| :--- | :--- | :--- |
| *Official URL*:http://hl7.org/fhir/us/core/StructureDefinition/us-core-vital-signs | *Version*:8.0.1 | |
| *Standards status:*[Trial-use](http://hl7.org/fhir/R4/versions.html#std-process) | [Maturity Level](http://hl7.org/fhir/versions.html#maturity): 3 | *Computable Name*:USCoreVitalSignsProfile |
| *Other Identifiers:*OID:2.16.840.1.113883.4.642.40.2.42.68 | | |
| **Copyright/Legal**: Used by permission of HL7 International, all rights reserved Creative Commons License | | |

 
This profile is based on the base[FHIR Vital Signs Profile](http://hl7.org/fhir/R4/observation-vitalsigns.html)and defines**additional**constraints on the Observation resource to represent vital signs observations. It specifies which core elements, extensions, vocabularies, and value sets**SHALL**be present in the resource and constrains how the elements are used. Providing the floor for standards development for specific use cases promotes interoperability and adoption. This US Core profiles that are derived from this profile are listed below. 

### Mandatory and Must Support Data Elements

The following data elements must always be present ([Mandatory](must-support.md) definition) or must be supported if the data is present in the sending system ([Must Support](must-support.md) definition). They are presented below in a simple human-readable explanation. Profile-specific guidance and examples are provided as well. The [Formal Views](#profile) below provides the formal summary, definitions, and terminology requirements. The "Snapshot Table (Must Support)" tab below displays all the Mandatory and Must Support data elements for this profile and those inherited from the US Core Vital Signs Profile.

**Each Observation Must Have:**

1. a status
1. a category code of "vital-signs"
1. a[LOINC](http://loinc.org)code, if available, which tells you what is being measured
1. a patient
1. a clinically relevant time

**Each Observation Must Support:**

1. a performer*
1. a result value
* if the result value is a numeric quantity, a standard [UCUM](http://unitsofmeasure.org) unit

1. a reason if the value is absent*
1. component results

*see guidance below

**Profile Specific Implementation Guidance:**

* A code system value **SHOULD** be supplied for each additional code.
* The observations **MAY** have [component](http://hl7.org/fhir/R4/observation.html#gr-comp) observations. For example, to qualify the vital sign observation, 8310-5 - **Body temperature**, 8327-9 - **Body temperature measurement site** (oral, forehead, rectal, etc.) may be used as a component observation. The FHIR core specification [vital signs table](http://hl7.org/fhir/R4/observation-vitalsigns.html#vitals-table) provides several of these.
* *An Observation without a value, **SHALL** include a reason why the data is absent **unless** there are 1) component observations, or 2) reporting panel observations using `Observation.hasMember`. 
* For further guidance, see the [Observation Grouping](http://hl7.org/fhir/R4/observation.html#obsgrouping) section in FHIR Specification.
* Systems that never provide an observation without a value are not required to support `Observation.dataAbsentReason`.
 
* *An `Observation.component` without a value, **SHALL** include a reason why the data is absent. 
* Systems that never provide a component observation without a component value are not required to support `Observation.component.dataAbsentReason`.
 
* Implementers may use this profile as a base for other vital signs in addition to those in this guide.

* *The profile elements `Observation.performer and Observation.device` communicate the [individual level provenance](basic-provenance.md#individual-level-provenance) author data corresponding to the U.S. Core Data for Interoperability (USCDI) Provenance Author Data Elements.

This profile conforms to the base FHIR ver 4.0.1 vitals profile, which defines a **required** binding for `Quantity.code` concepts. This means validation errors occur when validating derived profiles that use other `Quantity.code` concepts such as `L/min` for `Observation.component.value(x)` in the [US Core Pulse Oximetry Profile](StructureDefinition-us-core-pulse-oximetry.md). This known issue has been corrected in the base FHIR specification since version 4.3.0 ("Release 4B").

**Usages:**

* Derived from this Profile: [US Core Pediatric Head Occipital Frontal Circumference Percentile Profile](StructureDefinition-head-occipital-frontal-circumference-percentile.md), [US Core Pediatric BMI for Age Observation Profile](StructureDefinition-pediatric-bmi-for-age.md), [US Core Pediatric Weight for Height Observation Profile](StructureDefinition-pediatric-weight-for-height.md), [US Core Blood Pressure Profile](StructureDefinition-us-core-blood-pressure.md)...Show 8 more,[US Core BMI Profile](StructureDefinition-us-core-bmi.md),[US Core Body Height Profile](StructureDefinition-us-core-body-height.md),[US Core Body Temperature Profile](StructureDefinition-us-core-body-temperature.md),[US Core Body Weight Profile](StructureDefinition-us-core-body-weight.md),[US Core Head Circumference Profile](StructureDefinition-us-core-head-circumference.md),[US Core Heart Rate Profile](StructureDefinition-us-core-heart-rate.md),[US Core Pulse Oximetry Profile](StructureDefinition-us-core-pulse-oximetry.md)and[US Core Respiratory Rate Profile](StructureDefinition-us-core-respiratory-rate.md)
* CapabilityStatements using this Profile: [US Core Client CapabilityStatement](CapabilityStatement-us-core-client.md) and [US Core Server CapabilityStatement](CapabilityStatement-us-core-server.md)

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/hl7.fhir.us.core|current/StructureDefinition/us-core-vital-signs)

**Changes since version 7.0.0:**

* The data elements list has changed

### 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-us-core-vital-signs.csv), [Excel](StructureDefinition-us-core-vital-signs.xlsx), [Schematron](StructureDefinition-us-core-vital-signs.sch) 

### Notes:

-------

**Quick Start** 

-------

Below is an overview of the required Server RESTful FHIR interactions for this profile - for example, search and read operations - when supporting the US Core interactions to access this profile's information (Profile Support + Interaction Support). Note that systems that support only US Core Profiles (Profile Only Support) are not required to support these interactions. See the [US Core Server CapabilityStatement](CapabilityStatement-us-core-server.md) for a complete list of supported RESTful interactions for this IG.

* See the [Scopes Format](scopes.md#scopes-format) section for a description of the SMART scopes syntax.
* See the [Search Syntax](general-guidance.md#search-syntax) section for a description of the US Core search syntax.
* See the [General Requirements](general-requirements.md) section for additional rules and expectations when a Server requires status parameters.
* See the [General Guidance](general-guidance.md) section for additional guidance on searching for multiple patients.

#### US Core Scopes

Servers providing access to vital signs data **SHALL** support these [US Core SMART Scopes](scopes.md#smart-scopes):

* [resource level scopes](http://hl7.org/fhir/smart-app-launch/STU2.2/scopes-and-launch-context.html#scopes-for-requesting-clinical-data): `<patient|user|system>/Observation.rs`
* [granular scopes](http://hl7.org/fhir/smart-app-launch/STU2.2/scopes-and-launch-context.html#finer-grained-resource-constraints-using-search-parameters): `<patient|user|system>/Observation.rs?category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs`

#### Mandatory Search Parameters:

The following search parameters and search parameter combinations SHALL be supported:

1. **SHALL**support searching using the combination of the**[`patient`](SearchParameter-us-core-observation-patient.md)**and**[`category`](SearchParameter-us-core-observation-category.md)**search parameters:`GET [base]/Observation?patient={Type/}[id]&category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs`Example:
1. GET [base]/Observation?patient=1134281&category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs
**Implementation Notes:**Fetches a bundle of all Observation resources for the specified patient and a category code =`vital-signs`([how to search by reference](http://hl7.org/fhir/R4/search.html#reference)and[how to search by token](http://hl7.org/fhir/R4/search.html#token))
1. **SHALL**support searching using the combination of the**[`patient`](SearchParameter-us-core-observation-patient.md)**and**[`code`](SearchParameter-us-core-observation-code.md)**search parameters:
* including optional support for **OR** search on `code` (e.g.`code={system|}[code],{system|}[code],...`)
`GET [base]/Observation?patient={Type/}[id]&code={system|}[code]{,{system|}[code],...}`Example:
1. GET [base]/Observation?patient=1186747&code=http://loinc.org|8867-4,http://loinc.org|9279-1,http://loinc.org|85354-9
**Implementation Notes:**Fetches a bundle of all Observation resources for the specified patient and observation code(s).**SHOULD**support search by multiple codes. The Observation`code`parameter searches `Observation.code only. ([how to search by reference](http://hl7.org/fhir/R4/search.html#reference)and[how to search by token](http://hl7.org/fhir/R4/search.html#token))
1. **SHALL**support searching using the combination of the**[`patient`](SearchParameter-us-core-observation-patient.md)**and**[`category`](SearchParameter-us-core-observation-category.md)**and**[`date`](SearchParameter-us-core-observation-date.md)**search parameters:
* including support for these `date` comparators: `gt,lt,ge,le`
* including optional support for **AND** search on `date` (e.g.`date=[date]&date=[date]]&...`)
`GET [base]/Observation?patient={Type/}[id]&category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs&date={gt|lt|ge|le}[date]{&date={gt|lt|ge|le}[date]&...}`Example:
1. GET [base]/Observation?patient=1134281&category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs&date=ge2020-01-01T00:00:00Z
**Implementation Notes:**Fetches a bundle of all Observation resources for the specified patient and date and a category code =`vital-signs`([how to search by reference](http://hl7.org/fhir/R4/search.html#reference)and[how to search by token](http://hl7.org/fhir/R4/search.html#token)and[how to search by date](http://hl7.org/fhir/R4/search.html#date))

#### Optional Search Parameters:

The following search parameter combinations **SHOULD** be supported:

1. **SHOULD**support searching using the combination of the**[`patient`](SearchParameter-us-core-observation-patient.md)**and**[`category`](SearchParameter-us-core-observation-category.md)**and**[`status`](SearchParameter-us-core-observation-status.md)**search parameters:
* including support for **OR** search on `status` (e.g.`status={system|}[code],{system|}[code],...`)
`GET [base]/Observation?patient={Type/}[id]&category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs&status={system|}[code]{,{system|}[code],...}`Example:
1. GET [base]/Observation?patient=1134281&category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs&status=final
**Implementation Notes:**Fetches a bundle of all Observation resources for the specified patient and category and status ([how to search by reference](http://hl7.org/fhir/R4/search.html#reference)and[how to search by token](http://hl7.org/fhir/R4/search.html#token))
1. **SHOULD**support searching using the combination of the**[`patient`](SearchParameter-us-core-observation-patient.md)**and**[`category`](SearchParameter-us-core-observation-category.md)**and**[`_lastUpdated`](SearchParameter-us-core-observation-lastupdated.md)**search parameters:
* including support for these `_lastUpdated` comparators: `gt,lt,ge,le`
* including optional support for **AND** search on `_lastUpdated` (e.g.`_lastUpdated=[date]&_lastUpdated=[date]]&...`)
`GET [base]/Observation?patient={Type/}[id]&category={system|}[code]&_lastUpdated={gt|lt|ge|le}[date]{&_lastUpdated={gt|lt|ge|le}[date]&...}`Example:
1. GET [base]/Observation?patient=1134281&category=http://terminology.hl7.org/CodeSystem/observation-category|vital-signs&_lastUpdated=ge2024-01-01T00:00:00Z
**Implementation Notes:**Fetches a bundle of all Observation resources for the specified patient and category and _lastUpdated. See the US Core General Guidance page for[Searching Using lastUpdated](general-guidance.md#searching-using-lastupdated). ([how to search by reference](http://hl7.org/fhir/R4/search.html#reference)and[how to search by token](http://hl7.org/fhir/R4/search.html#token)and[how to search by date](http://hl7.org/fhir/R4/search.html#date))
1. **SHOULD**support searching using the combination of the**[`patient`](SearchParameter-us-core-observation-patient.md)**and**[`code`](SearchParameter-us-core-observation-code.md)**and**[`date`](SearchParameter-us-core-observation-date.md)**search parameters:
* including optional support for **OR** search on `code` (e.g.`code={system|}[code],{system|}[code],...`)
* including support for these `date` comparators: `gt,lt,ge,le`
* including optional support for **AND** search on `date` (e.g.`date=[date]&date=[date]]&...`)
`GET [base]/Observation?patient={Type/}[id]&code={system|}[code]{,{system|}[code],...}&date={gt|lt|ge|le}[date]{&date={gt|lt|ge|le}[date]&...}`Example:
1. GET [base]/Observation?patient=1186747&code=http://loinc.org|8867-4,http://loinc.org|9279-1,http://loinc.org|85354-9&date=ge2020-01-01T00:00:00Z
**Implementation Notes:**Fetches a bundle of all Observation resources for the specified patient and date and report code(s).**SHOULD**support search by multiple codes. ([how to search by reference](http://hl7.org/fhir/R4/search.html#reference)and[how to search by token](http://hl7.org/fhir/R4/search.html#token)and[how to search by date](http://hl7.org/fhir/R4/search.html#date))



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "us-core-vital-signs",
  "extension" : [
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode" : "cgp"
    },
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger" : 3,
      "_valueInteger" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical" : "http://hl7.org/fhir/us/core/ImplementationGuide/hl7.fhir.us.core"
          }
        ]
      }
    },
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode" : "trial-use",
      "_valueCode" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical" : "http://hl7.org/fhir/us/core/ImplementationGuide/hl7.fhir.us.core"
          }
        ]
      }
    }
  ],
  "url" : "http://hl7.org/fhir/us/core/StructureDefinition/us-core-vital-signs",
  "identifier" : [
    {
      "system" : "urn:ietf:rfc:3986",
      "value" : "urn:oid:2.16.840.1.113883.4.642.40.2.42.68"
    }
  ],
  "version" : "8.0.1",
  "name" : "USCoreVitalSignsProfile",
  "title" : "US Core Vital Signs Profile",
  "status" : "active",
  "experimental" : false,
  "date" : "2023-10-17",
  "publisher" : "HL7 International / Cross-Group Projects",
  "contact" : [
    {
      "name" : "HL7 International / Cross-Group Projects",
      "telecom" : [
        {
          "system" : "url",
          "value" : "http://www.hl7.org/Special/committees/cgp"
        },
        {
          "system" : "email",
          "value" : "cgp@lists.HL7.org"
        }
      ]
    }
  ],
  "description" : "This profile is based on the base [FHIR Vital Signs Profile](http://hl7.org/fhir/R4/observation-vitalsigns.html)  and defines *additional* constraints on the Observation resource to represent vital  signs observations. It specifies which core elements, extensions,  vocabularies, and value sets **SHALL** be present in the resource and constrains how the elements are used. Providing the floor for standards development for specific use cases promotes interoperability and adoption.  This US Core profiles that are derived from this profile  are listed below.",
  "jurisdiction" : [
    {
      "coding" : [
        {
          "system" : "urn:iso:std:iso:3166",
          "code" : "US"
        }
      ]
    }
  ],
  "copyright" : "Used by permission of HL7 International, all rights reserved Creative Commons License",
  "fhirVersion" : "4.0.1",
  "mapping" : [
    {
      "identity" : "workflow",
      "uri" : "http://hl7.org/fhir/workflow",
      "name" : "Workflow Pattern"
    },
    {
      "identity" : "sct-concept",
      "uri" : "http://snomed.info/conceptdomain",
      "name" : "SNOMED CT Concept Domain Binding"
    },
    {
      "identity" : "v2",
      "uri" : "http://hl7.org/v2",
      "name" : "HL7 v2 Mapping"
    },
    {
      "identity" : "rim",
      "uri" : "http://hl7.org/v3",
      "name" : "RIM Mapping"
    },
    {
      "identity" : "w5",
      "uri" : "http://hl7.org/fhir/fivews",
      "name" : "FiveWs Pattern Mapping"
    },
    {
      "identity" : "sct-attr",
      "uri" : "http://snomed.org/attributebinding",
      "name" : "SNOMED CT Attribute Binding"
    }
  ],
  "kind" : "resource",
  "abstract" : false,
  "type" : "Observation",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/vitalsigns",
  "derivation" : "constraint",
  "differential" : {
    "element" : [
      {
        "id" : "Observation",
        "path" : "Observation",
        "short" : "US Core Vital Signs Profile"
      },
      {
        "id" : "Observation.status",
        "path" : "Observation.status",
        "mustSupport" : true
      },
      {
        "id" : "Observation.category",
        "path" : "Observation.category",
        "slicing" : {
          "discriminator" : [
            {
              "type" : "value",
              "path" : "coding.code"
            },
            {
              "type" : "value",
              "path" : "coding.system"
            }
          ],
          "ordered" : false,
          "rules" : "open"
        },
        "min" : 1,
        "max" : "*",
        "type" : [
          {
            "code" : "CodeableConcept"
          }
        ],
        "mustSupport" : true
      },
      {
        "id" : "Observation.category:VSCat",
        "path" : "Observation.category",
        "sliceName" : "VSCat",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "CodeableConcept"
          }
        ],
        "mustSupport" : true
      },
      {
        "id" : "Observation.category:VSCat.coding",
        "path" : "Observation.category.coding",
        "min" : 1,
        "max" : "*",
        "type" : [
          {
            "code" : "Coding"
          }
        ],
        "mustSupport" : true
      },
      {
        "id" : "Observation.category:VSCat.coding.system",
        "path" : "Observation.category.coding.system",
        "short" : "Identity of the terminology system",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "uri"
          }
        ],
        "fixedUri" : "http://terminology.hl7.org/CodeSystem/observation-category",
        "mustSupport" : true
      },
      {
        "id" : "Observation.category:VSCat.coding.code",
        "path" : "Observation.category.coding.code",
        "short" : "Symbol in syntax defined by the system",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "code"
          }
        ],
        "fixedCode" : "vital-signs",
        "mustSupport" : true
      },
      {
        "id" : "Observation.code",
        "path" : "Observation.code",
        "short" : "Coded vital sign result type",
        "mustSupport" : true,
        "binding" : {
          "strength" : "extensible",
          "description" : "Vital sign result types",
          "valueSet" : "http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.62"
        }
      },
      {
        "id" : "Observation.subject",
        "path" : "Observation.subject",
        "type" : [
          {
            "code" : "Reference",
            "targetProfile" : [
              "http://hl7.org/fhir/us/core/StructureDefinition/us-core-patient"
            ]
          }
        ],
        "mustSupport" : true
      },
      {
        "id" : "Observation.effective[x]",
        "path" : "Observation.effective[x]",
        "short" : "Often just a dateTime for Vital Signs",
        "type" : [
          {
            "extension" : [
              {
                "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                "valueBoolean" : true
              }
            ],
            "code" : "dateTime"
          },
          {
            "code" : "Period"
          }
        ],
        "mustSupport" : true
      },
      {
        "id" : "Observation.performer",
        "path" : "Observation.performer",
        "type" : [
          {
            "code" : "Reference",
            "targetProfile" : [
              "http://hl7.org/fhir/us/core/StructureDefinition/us-core-practitioner",
              "http://hl7.org/fhir/us/core/StructureDefinition/us-core-organization",
              "http://hl7.org/fhir/us/core/StructureDefinition/us-core-patient",
              "http://hl7.org/fhir/StructureDefinition/PractitionerRole",
              "http://hl7.org/fhir/us/core/StructureDefinition/us-core-careteam",
              "http://hl7.org/fhir/us/core/StructureDefinition/us-core-relatedperson"
            ],
            "_targetProfile" : [
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                    "valueBoolean" : false
                  }
                ]
              },
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                    "valueBoolean" : false
                  }
                ]
              },
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                    "valueBoolean" : false
                  }
                ]
              },
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                    "valueBoolean" : false
                  }
                ]
              },
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                    "valueBoolean" : false
                  }
                ]
              },
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                    "valueBoolean" : false
                  }
                ]
              }
            ]
          }
        ],
        "mustSupport" : true
      },
      {
        "id" : "Observation.value[x]",
        "path" : "Observation.value[x]",
        "short" : "Vital Signs Value",
        "definition" : "Vital Signs value are typically recorded using the Quantity data type.",
        "type" : [
          {
            "extension" : [
              {
                "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                "valueBoolean" : true
              }
            ],
            "code" : "Quantity"
          },
          {
            "code" : "CodeableConcept"
          },
          {
            "code" : "string"
          },
          {
            "code" : "boolean"
          },
          {
            "code" : "integer"
          },
          {
            "code" : "Range"
          },
          {
            "code" : "Ratio"
          },
          {
            "code" : "SampledData"
          },
          {
            "code" : "time"
          },
          {
            "code" : "dateTime"
          },
          {
            "code" : "Period"
          }
        ],
        "mustSupport" : true,
        "binding" : {
          "strength" : "extensible",
          "description" : "Common UCUM units for recording Vital Signs.",
          "valueSet" : "http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1"
        }
      },
      {
        "id" : "Observation.dataAbsentReason",
        "path" : "Observation.dataAbsentReason",
        "mustSupport" : true
      },
      {
        "id" : "Observation.component",
        "path" : "Observation.component",
        "short" : "Component observations",
        "definition" : "Used when reporting component observation such as systolic and diastolic blood pressure.",
        "mustSupport" : true
      },
      {
        "id" : "Observation.component.code",
        "path" : "Observation.component.code",
        "short" : "Coded vital sign result type",
        "mustSupport" : true,
        "binding" : {
          "strength" : "extensible",
          "description" : "Vital sign result types",
          "valueSet" : "http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.62"
        }
      },
      {
        "id" : "Observation.component.value[x]",
        "path" : "Observation.component.value[x]",
        "short" : "Vital Sign Component Value",
        "definition" : "Vital Signs value are typically recorded using the Quantity data type. For supporting observations such as cuff size could use other datatypes such as CodeableConcept.",
        "type" : [
          {
            "extension" : [
              {
                "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support",
                "valueBoolean" : true
              }
            ],
            "code" : "Quantity"
          },
          {
            "code" : "CodeableConcept"
          },
          {
            "code" : "string"
          },
          {
            "code" : "boolean"
          },
          {
            "code" : "integer"
          },
          {
            "code" : "Range"
          },
          {
            "code" : "Ratio"
          },
          {
            "code" : "SampledData"
          },
          {
            "code" : "time"
          },
          {
            "code" : "dateTime"
          },
          {
            "code" : "Period"
          }
        ],
        "mustSupport" : true,
        "binding" : {
          "strength" : "extensible",
          "description" : "Common UCUM units for recording Vital Signs.",
          "valueSet" : "http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1"
        }
      },
      {
        "id" : "Observation.component.dataAbsentReason",
        "path" : "Observation.component.dataAbsentReason",
        "mustSupport" : true
      }
    ]
  }
}

```
