US Core Body Weight Profile - US Core Implementation Guide v10.0.0-ballot

US Core Implementation Guide, published by HL7 International / Cross-Group Projects. This guide is not an authorized publication; it is the continuous build for version 10.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/US-Core/ and changes regularly. See the Directory of published versions

Resource Profile: US Core Body Weight Profile

Official URL: http://hl7.org/fhir/us/core/StructureDefinition/us-core-body-weight		Version: 10.0.0-ballot
Standards status: Trial-use	Maturity Level: 5	Computable Name: USCoreBodyWeightProfile
Other Identifiers: OID:2.16.840.1.113883.4.642.40.2.42.13
Copyright/Legal: Used by permission of HL7 International, all rights reserved Creative Commons License

The US Core Body Weight Profile inherits from the US Core Vital Signs Profile. This profile sets minimum expectations for the Observation resource to record, search, and fetch body weight observations with a standard LOINC code and UCUM units of measure. It specifies which additional 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.

Example Usage Scenarios:

The following are example usage scenarios for this profile:

Query for body weight observations
Record or update body weight observations

Mandatory and Must Support Data Elements

In addition to the Mandatory and Must Support data elements in the US Core Vital Signs Profile, the following data elements must always be present (Mandatory definition) or must be supported if the data is present in the sending system (Must Support definition). They are presented below in a simple human-readable explanation. Profile specific guidance and examples are provided as well. The Formal Views below provides the formal summary, definitions, and terminology requirements.
Note that the "Differential Table" displays elements unique to this profile and the "Key Elements Table” displays a combined view of elements for this profile and the US Core Vital Signs Profile.

Each Observation Must Have:

a patient
a fixed code for body weight

Each Observation Must Support:

a result value¹

¹ see guidance below

Profile Specific Implementation Guidance

This section provides detailed implementation guidance for the US Core Profile to support implementation and certification.

Note that this profile also conforms to the base FHIR Vital Signs Profile.

The observations MAY have additional codes that translate or map to the Observation code or category codes.^§ For example:
- providing a local system-specific code
- providing more specific codes such as 8306-3 - Body height - lying in addition to 8302-2 - Body height. Several additional observation codes are provided in the FHIR core specification vital signs table.
A code system value SHOULD be supplied for each additional code.^§
The observations MAY have component 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 provides several of these.
¹An 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 section in FHIR Specification.
- Systems that never provide an observation without a value MAY choose not to support Observation.dataAbsentReason.^§
¹An 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 MAY choose not to support Observation.component.dataAbsentReason.^§
Implementers may use this profile as a base for other vital signs in addition to those in this guide.

Usages:

Examples for this Profile: Observation/weight
CapabilityStatements using this Profile: US Core Client CapabilityStatement and US Core Server CapabilityStatement

You can also check for usages in the FHIR IG Statistics

Changes since version 9.0.0:

No changes

Formal Views of Profile Content

Description of Profiles, Differentials, Snapshots and how the different presentations work.

Key Elements Table
Differential Table
Snapshot Table
Statistics/References
All

Name	Flags	Card.	Type	Description & Constraints Filter: Bindings Constraints Obligations
Observation	C	0..*	USCoreVitalSignsProfile	US Core Body Weight Profile Constraints: obs-6, obs-7, vs-2
Observation.implicitRules	This element is a modifier element. This element is included in summaries.	0..1	uri	A set of rules under which this content was created
Observation.modifierExtension	This element is a modifier element.	0..*	Extension	Extensions that cannot be ignored
Observation.status	This element is a modifier element. This element must be supported. This element is included in summaries.	1..1	code	registered \| preliminary \| final \| amended + Binding: ObservationStatus (required)
Observation.Slices for category	This element must be supported.	1..*	CodeableConcept	Classification of type of observation Slice: Unordered, Open by value:coding.code, value:coding.system Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories. Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them
Observation.Slices for category.category:VSCat	This element must be supported.	1..1	CodeableConcept	Classification of type of observation Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
Observation.Slices for category.category:VSCat.coding	This element must be supported. This element is included in summaries.	1..*	Coding	Code defined by a terminology system
Observation.Slices for category.category:VSCat.coding.system	This element must be supported. This element is included in summaries.	1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category (no extensions allowed)
Observation.Slices for category.category:VSCat.coding.code	This element must be supported. This element is included in summaries.	1..1	code	Symbol in syntax defined by the system Fixed Value: vital-signs (no extensions allowed)
Observation.code	This element must be supported. This element is included in summaries.	1..1	CodeableConcept	Body Weight Binding: Vital Sign Result Type (extensible): Vital sign result types Required Pattern: `{ "coding" : [ { "system" : "http://loinc.org", "code" : "29463-7" } ] }`
Observation.subject	This element must be supported. This element is included in summaries.	1..1	Reference(US Core Patient Profile)	Who and/or what the observation is about
Observation.effective[x]	This element must be supported. This element is included in summaries. C	1..1		Often just a dateTime for Vital Signs Constraints: vs-1
Observation.effective[x].effectiveDateTime			dateTime This target must be supported.
Observation.effective[x].effectivePeriod			Period
Observation.performer	This element must be supported. This element is included in summaries.	0..*	Reference(US Core Practitioner Profile \| US Core Organization Profile \| US Core Patient Profile \| PractitionerRole \| US Core CareTeam Profile \| US Core RelatedPerson Profile)	Who is responsible for the observation
Observation.Slices for value[x]	This element must be supported. This element is included in summaries. C	0..1		Vital Signs Value Slice: Unordered, Closed by type:$this Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs. Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them Other type slices that contain no new information are not shown in this view
Observation.Slices for value[x].valueQuantity			Quantity This type must be supported.
Observation.Slices for value[x].valueCodeableConcept			CodeableConcept
Observation.Slices for value[x].valueString			string
Observation.Slices for value[x].valueBoolean			boolean
Observation.Slices for value[x].valueInteger			integer
Observation.Slices for value[x].valueRange			Range
Observation.Slices for value[x].valueRatio			Ratio
Observation.Slices for value[x].valueSampledData			SampledData
Observation.Slices for value[x].valueTime			time
Observation.Slices for value[x].valueDateTime			dateTime
Observation.Slices for value[x].valuePeriod			Period
Observation.Slices for value[x].value[x]:valueQuantity	This element must be supported. This element is included in summaries. C	0..1	Quantity This type must be supported.	Vital Signs Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
Observation.Slices for value[x].value[x]:valueQuantity.value	This element must be supported. This element is included in summaries.	1..1	decimal	Numerical value (with implicit precision)
Observation.Slices for value[x].value[x]:valueQuantity.comparator	This element is a modifier element. This element is included in summaries.	0..1	code	< \| <= \| >= \| > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
Observation.Slices for value[x].value[x]:valueQuantity.unit	This element must be supported. This element is included in summaries.	1..1	string	Unit representation
Observation.Slices for value[x].value[x]:valueQuantity.system	This element must be supported. This element is included in summaries. C	1..1	uri	System that defines coded unit form Fixed Value: http://unitsofmeasure.org (no extensions allowed)
Observation.Slices for value[x].value[x]:valueQuantity.code	This element must be supported. This element is included in summaries.	1..1	code	Coded responses from the common UCUM units for vital signs value set. Binding: BodyWeightUnits (required)
Observation.dataAbsentReason	This element must be supported. C	0..1	CodeableConcept	Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Observation.component	This element must be supported. This element is included in summaries. C	0..*	BackboneElement	Component observations Constraints: vs-3
Observation.component.modifierExtension	This element is a modifier element. This element is included in summaries.	0..*	Extension	Extensions that cannot be ignored even if unrecognized
Observation.component.code	This element must be supported. This element is included in summaries.	1..1	CodeableConcept	Coded vital sign result type Binding: Vital Sign Result Type (extensible): Vital sign result types
Observation.component.value[x]	This element must be supported. This element is included in summaries. C	0..1		Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
Observation.component.value[x].valueQuantity			Quantity This type must be supported.
Observation.component.value[x].valueCodeableConcept			CodeableConcept
Observation.component.value[x].valueString			string
Observation.component.value[x].valueBoolean			boolean
Observation.component.value[x].valueInteger			integer
Observation.component.value[x].valueRange			Range
Observation.component.value[x].valueRatio			Ratio
Observation.component.value[x].valueSampledData			SampledData
Observation.component.value[x].valueTime			time
Observation.component.value[x].valueDateTime			dateTime
Observation.component.value[x].valuePeriod			Period
Observation.component.dataAbsentReason	This element must be supported. C	0..1	CodeableConcept	Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Documentation for this format

Terminology Bindings

Path	Status	Usage	ValueSet	Version	Source
Observation.status	Base	required	ObservationStatus	📍4.0.1	FHIR Std.
Observation.category	Base	preferred	Observation Category Codes	📍4.0.1	FHIR Std.
Observation.category:VSCat	Base	preferred	Observation Category Codes	📍4.0.1	FHIR Std.
Observation.code	Base	extensible	Vital Sign Result Type	⏿20251202	tx.fhir.org
Observation.value[x]	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity.comparator	Base	required	QuantityComparator	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity.code	Base	required	Body Weight Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueCodeableConcept	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueString	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueRange	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.dataAbsentReason	Base	extensible	DataAbsentReason	📍4.0.1	FHIR Std.
Observation.component.code	Base	extensible	Vital Sign Result Type	⏿20251202	tx.fhir.org
Observation.component.value[x]	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.component.dataAbsentReason	Base	extensible	DataAbsentReason	📍4.0.1	FHIR Std.

Constraints

Grade

Path(s)

Description

Expression

This structure is derived from USCoreVitalSignsProfile

Name	Flags	Card.	Type	Description & Constraints Filter: Bindings Constraints Obligations
Observation		0..*	USCoreVitalSignsProfile	US Core Body Weight Profile
Observation.code	This element must be supported.	1..1	CodeableConcept	Body Weight Required Pattern: `{ "coding" : [ { "system" : "http://loinc.org", "code" : "29463-7" } ] }`
Observation.valueQuantity	This element must be supported.	0..1	Quantity This type must be supported.	Vital Signs Value
Observation.valueQuantity.value	This element must be supported.	1..1	decimal	Numerical value (with implicit precision)
Observation.valueQuantity.unit	This element must be supported.	1..1	string	Unit representation
Observation.valueQuantity.system	This element must be supported.	1..1	uri	System that defines coded unit form Fixed Value: http://unitsofmeasure.org (no extensions allowed)
Observation.valueQuantity.code	This element must be supported.	1..1	code	Coded responses from the common UCUM units for vital signs value set. Binding: BodyWeightUnits (required)
Documentation for this format

Terminology Bindings (Differential)

Path	Status	Usage	ValueSet	Version	Source
Observation.valueQuantity.code	Base	required	Body Weight Units	📍4.0.1	FHIR Std.

Description & Constraints Filter:

Observation C 0..* USCoreVitalSignsProfile US Core Body Weight Profile
Constraints: obs-6, obs-7, vs-2

Observation.id This element is included in summaries. 0..1 id Logical id of this artifact

Observation.meta This element is included in summaries. 0..1 Meta Metadata about the resource

Observation.implicitRules This element is a modifier element. This element is included in summaries. 0..1 uri A set of rules under which this content was created

language

0..1

code

Language of the resource content
Binding: CommonLanguages (preferred): A human language.

Additional Bindings

Purpose

AllLanguages

Max Binding

Observation.text 0..1 Narrative Text summary of the resource, for human interpretation
This profile does not constrain the narrative in regard to content, language, or traceability to data elements

Observation.contained 0..* Resource Contained, inline Resources

Observation.extension 0..* Extension Additional content defined by implementations

Observation.modifierExtension This element is a modifier element. 0..* Extension Extensions that cannot be ignored

Observation.identifier This element is included in summaries. 0..* Identifier Business Identifier for observation

Observation.status This element is a modifier element. This element must be supported. This element is included in summaries. 1..1 code registered | preliminary | final | amended +
Binding: ObservationStatus (required)

Observation.Slices for category This element must be supported. 1..* CodeableConcept Classification of type of observation
Slice: Unordered, Open by value:coding.code, value:coding.system
Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.

Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them

Observation.Slices for category.category:VSCat This element must be supported. 1..1 CodeableConcept Classification of type of observation
Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.

Observation.Slices for category.category:VSCat.id 0..1 string Unique id for inter-element referencing

Observation.Slices for category.category:VSCat.extension 0..* Extension Additional content defined by implementations
Slice: Unordered, Open by value:url

Observation.Slices for category.category:VSCat.coding This element must be supported. This element is included in summaries. 1..* Coding Code defined by a terminology system

Observation.Slices for category.category:VSCat.coding.id 0..1 string Unique id for inter-element referencing

Observation.Slices for category.category:VSCat.coding.extension 0..* Extension Additional content defined by implementations
Slice: Unordered, Open by value:url

Observation.Slices for category.category:VSCat.coding.system This element must be supported. This element is included in summaries. 1..1 uri Identity of the terminology system
Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category (no extensions allowed)

Observation.Slices for category.category:VSCat.coding.version This element is included in summaries. 0..1 string Version of the system - if relevant

Observation.Slices for category.category:VSCat.coding.code This element must be supported. This element is included in summaries. 1..1 code Symbol in syntax defined by the system
Fixed Value: vital-signs (no extensions allowed)

Observation.Slices for category.category:VSCat.coding.display This element is included in summaries. 0..1 string Representation defined by the system

Observation.Slices for category.category:VSCat.coding.userSelected This element is included in summaries. 0..1 boolean If this coding was chosen directly by the user

Observation.Slices for category.category:VSCat.text This element is included in summaries. 0..1 string Plain text representation of the concept

code

1..1

CodeableConcept

Body Weight
Binding: Vital Sign Result Type

(extensible): Vital sign result types
Required Pattern:

{
  "coding" : [
    {
      "system" : "http://loinc.org",
      "code" : "29463-7"
    }
  ]
}

Observation.subject This element must be supported. This element is included in summaries. 1..1 Reference(US Core Patient Profile) Who and/or what the observation is about

Observation.focus This element is included in summaries. 0..* Reference(Resource) What the observation is about, when it is not about the subject of record

Observation.encounter This element is included in summaries. 0..1 Reference(Encounter) Healthcare event during which this observation is made

Observation.effective[x] This element must be supported. This element is included in summaries. C 1..1 Often just a dateTime for Vital Signs
Constraints: vs-1

Observation.effective[x].effectiveDateTime dateTime This target must be supported.

Observation.effective[x].effectivePeriod Period

Observation.issued This element is included in summaries. 0..1 instant Date/Time this version was made available

Observation.performer This element must be supported. This element is included in summaries. 0..* Reference(US Core Practitioner Profile | US Core Organization Profile | US Core Patient Profile | PractitionerRole | US Core CareTeam Profile | US Core RelatedPerson Profile) Who is responsible for the observation

Observation.Slices for value[x] This element must be supported. This element is included in summaries. C 0..1 Vital Signs Value
Slice: Unordered, Closed by type:$this
Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them Other type slices that contain no new information are not shown in this view

Observation.Slices for value[x].valueQuantity Quantity This type must be supported.

Observation.Slices for value[x].valueCodeableConcept CodeableConcept

Observation.Slices for value[x].valueString string

Observation.Slices for value[x].valueBoolean boolean

Observation.Slices for value[x].valueInteger integer

Observation.Slices for value[x].valueRange Range

Observation.Slices for value[x].valueRatio Ratio

Observation.Slices for value[x].valueSampledData SampledData

Observation.Slices for value[x].valueTime time

Observation.Slices for value[x].valueDateTime dateTime

Observation.Slices for value[x].valuePeriod Period

Observation.Slices for value[x].value[x]:valueQuantity This element must be supported. This element is included in summaries. C 0..1 Quantity This type must be supported. Vital Signs Value
Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.

Observation.Slices for value[x].value[x]:valueQuantity.id 0..1 string Unique id for inter-element referencing

Observation.Slices for value[x].value[x]:valueQuantity.extension 0..* Extension Additional content defined by implementations
Slice: Unordered, Open by value:url

Observation.Slices for value[x].value[x]:valueQuantity.value This element must be supported. This element is included in summaries. 1..1 decimal Numerical value (with implicit precision)

Observation.Slices for value[x].value[x]:valueQuantity.comparator This element is a modifier element. This element is included in summaries. 0..1 code < | <= | >= | > - how to understand the value
Binding: QuantityComparator (required): How the Quantity should be understood and represented.

Observation.Slices for value[x].value[x]:valueQuantity.unit This element must be supported. This element is included in summaries. 1..1 string Unit representation

Observation.Slices for value[x].value[x]:valueQuantity.system This element must be supported. This element is included in summaries. C 1..1 uri System that defines coded unit form
Fixed Value: http://unitsofmeasure.org (no extensions allowed)

Observation.Slices for value[x].value[x]:valueQuantity.code This element must be supported. This element is included in summaries. 1..1 code Coded responses from the common UCUM units for vital signs value set.
Binding: BodyWeightUnits (required)

Observation.dataAbsentReason This element must be supported. C 0..1 CodeableConcept Why the result is missing
Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.

Observation.interpretation 0..* CodeableConcept High, low, normal, etc.
Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.

Observation.note 0..* Annotation Comments about the observation

Observation.bodySite 0..1 CodeableConcept Observed body part
Binding: SNOMEDCTBodyStructures (example): Codes describing anatomical locations. May include laterality.

Observation.method 0..1 CodeableConcept How it was done
Binding: ObservationMethods (example): Methods for simple observations.

Observation.specimen 0..1 Reference(Specimen) Specimen used for this observation

Observation.device 0..1 Reference(Device | DeviceMetric) (Measurement) Device

Observation.referenceRange C 0..* BackboneElement Provides guide for interpretation
Constraints: obs-3

Observation.referenceRange.id 0..1 string Unique id for inter-element referencing

Observation.referenceRange.extension 0..* Extension Additional content defined by implementations

Observation.referenceRange.modifierExtension This element is a modifier element. This element is included in summaries. 0..* Extension Extensions that cannot be ignored even if unrecognized

Observation.referenceRange.low C 0..1 SimpleQuantity(4.0.1) Low Range, if relevant
Constraints: sqty-1

Observation.referenceRange.high C 0..1 SimpleQuantity(4.0.1) High Range, if relevant
Constraints: sqty-1

Observation.referenceRange.type 0..1 CodeableConcept Reference range qualifier
Binding: ObservationReferenceRangeMeaningCodes (preferred): Code for the meaning of a reference range.

Observation.referenceRange.appliesTo 0..* CodeableConcept Reference range population
Binding: ObservationReferenceRangeAppliesToCodes (example): Codes identifying the population the reference range applies to.

Observation.referenceRange.age 0..1 Range Applicable age range, if relevant

Observation.referenceRange.text 0..1 string Text based reference range in an observation

Observation.hasMember This element is included in summaries. 0..* Reference(QuestionnaireResponse | MolecularSequence | Vital Signs Profile) Used when reporting vital signs panel components

Observation.component This element must be supported. This element is included in summaries. C 0..* BackboneElement Component observations
Constraints: vs-3

Observation.component.id 0..1 string Unique id for inter-element referencing

Observation.component.extension 0..* Extension Additional content defined by implementations

Observation.component.modifierExtension This element is a modifier element. This element is included in summaries. 0..* Extension Extensions that cannot be ignored even if unrecognized

Observation.component.code This element must be supported. This element is included in summaries. 1..1 CodeableConcept Coded vital sign result type
Binding: Vital Sign Result Type (extensible): Vital sign result types

Observation.component.value[x] This element must be supported. This element is included in summaries. C 0..1 Vital Sign Component Value
Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.

Observation.component.value[x].valueQuantity Quantity This type must be supported.

Observation.component.value[x].valueCodeableConcept CodeableConcept

Observation.component.value[x].valueString string

Observation.component.value[x].valueBoolean boolean

Observation.component.value[x].valueInteger integer

Observation.component.value[x].valueRange Range

Observation.component.value[x].valueRatio Ratio

Observation.component.value[x].valueSampledData SampledData

Observation.component.value[x].valueTime time

Observation.component.value[x].valueDateTime dateTime

Observation.component.value[x].valuePeriod Period

Observation.component.dataAbsentReason This element must be supported. C 0..1 CodeableConcept Why the component result is missing
Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.

Observation.component.interpretation 0..* CodeableConcept High, low, normal, etc.
Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.

Observation.component.referenceRange 0..* See referenceRange (Observation) Provides guide for interpretation of component result

Documentation for this format

Terminology Bindings

Path	Status	Usage	ValueSet	Version	Source
Observation.language	Base	preferred	Common Languages	📍4.0.1	FHIR Std.
Observation.status	Base	required	ObservationStatus	📍4.0.1	FHIR Std.
Observation.category	Base	preferred	Observation Category Codes	📍4.0.1	FHIR Std.
Observation.category:VSCat	Base	preferred	Observation Category Codes	📍4.0.1	FHIR Std.
Observation.code	Base	extensible	Vital Sign Result Type	⏿20251202	tx.fhir.org
Observation.value[x]	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity.comparator	Base	required	QuantityComparator	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity.code	Base	required	Body Weight Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueCodeableConcept	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueString	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueRange	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.dataAbsentReason	Base	extensible	DataAbsentReason	📍4.0.1	FHIR Std.
Observation.interpretation	Base	extensible	Observation Interpretation Codes	📍4.0.1	FHIR Std.
Observation.bodySite	Base	example	SNOMED CT Body Structures	📍4.0.1	FHIR Std.
Observation.method	Base	example	Observation Methods	📍4.0.1	FHIR Std.
Observation.referenceRange.type	Base	preferred	Observation Reference Range Meaning Codes	📍4.0.1	FHIR Std.
Observation.referenceRange.appliesTo	Base	example	Observation Reference Range Applies To Codes	📍4.0.1	FHIR Std.
Observation.component.code	Base	extensible	Vital Sign Result Type	⏿20251202	tx.fhir.org
Observation.component.value[x]	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.component.dataAbsentReason	Base	extensible	DataAbsentReason	📍4.0.1	FHIR Std.
Observation.component.interpretation	Base	extensible	Observation Interpretation Codes	📍4.0.1	FHIR Std.

Constraints

Grade

Path(s)

Description

Expression

This structure is derived from USCoreVitalSignsProfile

Summary

Mandatory: 0 element(4 nested mandatory elements)
Must-Support: 6 elements
Fixed: 1 element

Maturity: 5

Key Elements View

Name	Flags	Card.	Type	Description & Constraints Filter: Bindings Constraints Obligations
Observation	C	0..*	USCoreVitalSignsProfile	US Core Body Weight Profile Constraints: obs-6, obs-7, vs-2
Observation.implicitRules	This element is a modifier element. This element is included in summaries.	0..1	uri	A set of rules under which this content was created
Observation.modifierExtension	This element is a modifier element.	0..*	Extension	Extensions that cannot be ignored
Observation.status	This element is a modifier element. This element must be supported. This element is included in summaries.	1..1	code	registered \| preliminary \| final \| amended + Binding: ObservationStatus (required)
Observation.Slices for category	This element must be supported.	1..*	CodeableConcept	Classification of type of observation Slice: Unordered, Open by value:coding.code, value:coding.system Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories. Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them
Observation.Slices for category.category:VSCat	This element must be supported.	1..1	CodeableConcept	Classification of type of observation Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
Observation.Slices for category.category:VSCat.coding	This element must be supported. This element is included in summaries.	1..*	Coding	Code defined by a terminology system
Observation.Slices for category.category:VSCat.coding.system	This element must be supported. This element is included in summaries.	1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category (no extensions allowed)
Observation.Slices for category.category:VSCat.coding.code	This element must be supported. This element is included in summaries.	1..1	code	Symbol in syntax defined by the system Fixed Value: vital-signs (no extensions allowed)
Observation.code	This element must be supported. This element is included in summaries.	1..1	CodeableConcept	Body Weight Binding: Vital Sign Result Type (extensible): Vital sign result types Required Pattern: `{ "coding" : [ { "system" : "http://loinc.org", "code" : "29463-7" } ] }`
Observation.subject	This element must be supported. This element is included in summaries.	1..1	Reference(US Core Patient Profile)	Who and/or what the observation is about
Observation.effective[x]	This element must be supported. This element is included in summaries. C	1..1		Often just a dateTime for Vital Signs Constraints: vs-1
Observation.effective[x].effectiveDateTime			dateTime This target must be supported.
Observation.effective[x].effectivePeriod			Period
Observation.performer	This element must be supported. This element is included in summaries.	0..*	Reference(US Core Practitioner Profile \| US Core Organization Profile \| US Core Patient Profile \| PractitionerRole \| US Core CareTeam Profile \| US Core RelatedPerson Profile)	Who is responsible for the observation
Observation.Slices for value[x]	This element must be supported. This element is included in summaries. C	0..1		Vital Signs Value Slice: Unordered, Closed by type:$this Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs. Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them Other type slices that contain no new information are not shown in this view
Observation.Slices for value[x].valueQuantity			Quantity This type must be supported.
Observation.Slices for value[x].valueCodeableConcept			CodeableConcept
Observation.Slices for value[x].valueString			string
Observation.Slices for value[x].valueBoolean			boolean
Observation.Slices for value[x].valueInteger			integer
Observation.Slices for value[x].valueRange			Range
Observation.Slices for value[x].valueRatio			Ratio
Observation.Slices for value[x].valueSampledData			SampledData
Observation.Slices for value[x].valueTime			time
Observation.Slices for value[x].valueDateTime			dateTime
Observation.Slices for value[x].valuePeriod			Period
Observation.Slices for value[x].value[x]:valueQuantity	This element must be supported. This element is included in summaries. C	0..1	Quantity This type must be supported.	Vital Signs Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
Observation.Slices for value[x].value[x]:valueQuantity.value	This element must be supported. This element is included in summaries.	1..1	decimal	Numerical value (with implicit precision)
Observation.Slices for value[x].value[x]:valueQuantity.comparator	This element is a modifier element. This element is included in summaries.	0..1	code	< \| <= \| >= \| > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
Observation.Slices for value[x].value[x]:valueQuantity.unit	This element must be supported. This element is included in summaries.	1..1	string	Unit representation
Observation.Slices for value[x].value[x]:valueQuantity.system	This element must be supported. This element is included in summaries. C	1..1	uri	System that defines coded unit form Fixed Value: http://unitsofmeasure.org (no extensions allowed)
Observation.Slices for value[x].value[x]:valueQuantity.code	This element must be supported. This element is included in summaries.	1..1	code	Coded responses from the common UCUM units for vital signs value set. Binding: BodyWeightUnits (required)
Observation.dataAbsentReason	This element must be supported. C	0..1	CodeableConcept	Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Observation.component	This element must be supported. This element is included in summaries. C	0..*	BackboneElement	Component observations Constraints: vs-3
Observation.component.modifierExtension	This element is a modifier element. This element is included in summaries.	0..*	Extension	Extensions that cannot be ignored even if unrecognized
Observation.component.code	This element must be supported. This element is included in summaries.	1..1	CodeableConcept	Coded vital sign result type Binding: Vital Sign Result Type (extensible): Vital sign result types
Observation.component.value[x]	This element must be supported. This element is included in summaries. C	0..1		Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
Observation.component.value[x].valueQuantity			Quantity This type must be supported.
Observation.component.value[x].valueCodeableConcept			CodeableConcept
Observation.component.value[x].valueString			string
Observation.component.value[x].valueBoolean			boolean
Observation.component.value[x].valueInteger			integer
Observation.component.value[x].valueRange			Range
Observation.component.value[x].valueRatio			Ratio
Observation.component.value[x].valueSampledData			SampledData
Observation.component.value[x].valueTime			time
Observation.component.value[x].valueDateTime			dateTime
Observation.component.value[x].valuePeriod			Period
Observation.component.dataAbsentReason	This element must be supported. C	0..1	CodeableConcept	Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Documentation for this format

Terminology Bindings

Path	Status	Usage	ValueSet	Version	Source
Observation.status	Base	required	ObservationStatus	📍4.0.1	FHIR Std.
Observation.category	Base	preferred	Observation Category Codes	📍4.0.1	FHIR Std.
Observation.category:VSCat	Base	preferred	Observation Category Codes	📍4.0.1	FHIR Std.
Observation.code	Base	extensible	Vital Sign Result Type	⏿20251202	tx.fhir.org
Observation.value[x]	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity.comparator	Base	required	QuantityComparator	📍4.0.1	FHIR Std.
Observation.value[x]:valueQuantity.code	Base	required	Body Weight Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueCodeableConcept	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueString	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.value[x]:valueRange	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.dataAbsentReason	Base	extensible	DataAbsentReason	📍4.0.1	FHIR Std.
Observation.component.code	Base	extensible	Vital Sign Result Type	⏿20251202	tx.fhir.org
Observation.component.value[x]	Base	extensible	Vital Signs Units	📍4.0.1	FHIR Std.
Observation.component.dataAbsentReason	Base	extensible	DataAbsentReason	📍4.0.1	FHIR Std.

Constraints

Grade

Path(s)

Description

Expression

Differential View

This structure is derived from USCoreVitalSignsProfile

Name	Flags	Card.	Type	Description & Constraints Filter: Bindings Constraints Obligations
Observation		0..*	USCoreVitalSignsProfile	US Core Body Weight Profile
Observation.code	This element must be supported.	1..1	CodeableConcept	Body Weight Required Pattern: `{ "coding" : [ { "system" : "http://loinc.org", "code" : "29463-7" } ] }`
Observation.valueQuantity	This element must be supported.	0..1	Quantity This type must be supported.	Vital Signs Value
Observation.valueQuantity.value	This element must be supported.	1..1	decimal	Numerical value (with implicit precision)
Observation.valueQuantity.unit	This element must be supported.	1..1	string	Unit representation
Observation.valueQuantity.system	This element must be supported.	1..1	uri	System that defines coded unit form Fixed Value: http://unitsofmeasure.org (no extensions allowed)
Observation.valueQuantity.code	This element must be supported.	1..1	code	Coded responses from the common UCUM units for vital signs value set. Binding: BodyWeightUnits (required)
Documentation for this format

Terminology Bindings (Differential)

Path	Status	Usage	ValueSet	Version	Source
Observation.valueQuantity.code	Base	required	Body Weight Units	📍4.0.1	FHIR Std.

Snapshot View