"A dimensioned quantity expressing the result of measuring" - HL7 V3
"A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies." - HL7 FHIR, Quantity. Note that the FHIR Quantity data type includes an optional comparator, which is not commonly used. In FHIM, we have created a sub type (QuantityWithComparator) that adds the comparator property.

Attributes
«CS» Code	unit	"The unit of measure specified in the Unified Code for Units of Measure (UCUM). The default unit is 1." - HL7 V3 "A computer processable form of the units in some unit representation system." - HL7 FHIR, Quantity.code.
«REAL» Decimal	value	"The magnitude of the quantity measured in terms of the unit" - HL7 V3 "The magnitude of the Monetary Amount in terms of currency" - HL7 V3 "The value of the measured amount. The value includes an implicit precision in the presentation of the value." - HL7 FHIR, Quantity.value. "Numerical value (with implicit precision)." HL7 FHIR, Money.value

 unit

Public «CS» Code unit

"The unit of measure specified in the Unified Code for Units of Measure (UCUM). The default unit is 1." - HL7 V3
"A computer processable form of the units in some unit representation system." - HL7 FHIR, Quantity.code.

Constraints:

Properties:

Aggregation	None
Alias
Association
Association End
Class	«PQ» Quantity
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
Keywords
Lower	1
Lower Value	(1)
Multiplicity	1
Name	unit
Name Expression
Namespace	«PQ» Quantity
Opposite
Owner	«PQ» Quantity
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Datatypes::Quantity::unit
Stereotype
Template Parameter
Type	«CS» Code
Upper	1
Upper Value	(1)
Visibility	Public

 value

Public «REAL» Decimal value

"The magnitude of the quantity measured in terms of the unit" - HL7 V3
"The magnitude of the Monetary Amount in terms of currency" - HL7 V3
"The value of the measured amount. The value includes an implicit precision in the presentation of the value." - HL7 FHIR, Quantity.value.
"Numerical value (with implicit precision)." HL7 FHIR, Money.value

Constraints:

Properties:

Aggregation	None
Alias
Association
Association End
Class	«PQ» Quantity
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
Keywords
Lower	1
Lower Value	(1)
Multiplicity	1
Name	value
Name Expression
Namespace	«PQ» Quantity
Opposite
Owner	«PQ» Quantity
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Datatypes::Quantity::value
Stereotype
Template Parameter
Type	«REAL» Decimal
Upper	1
Upper Value	(1)
Visibility	Public

• FHIR also has Age, Count, and Distance, which are restrictions on Quantity
• The amount that was or is to be supplied