Quantity

Question with a combination of a numeric value and unit, potentially with a comparator (< , >, etc.) as an answer. (valueQuantity).

There is an extension "http://hl7.org/fhir/StructureDefinition/questionnaire-unit" that can be used to define what unit should be captured (or the unit that has a ucum conversion from the provided unit).

You can use the UnitOption extension to specify a list of options for the unit of a quantity item.

Basic usage

Questionnaire-only

With Response

Advanced usage

With multiple unitOptions

With a single unitOption

tip

It is recommended to use the "questionnaire-unit" extension instead when there is only one unit to choose from.

Calculations

note

CalculatedExpression should evaluate to an integer or decimal value, which becomes valueQuantity.value. Unit, code and system will default to the unit provided via the "questionnaire-unit" extension.

View more advanced usages in Storybook's SDC section.

SDC Supported extensions

Code	Usage
variable	http://hl7.org/fhir/StructureDefinition/variable
initialExpression	http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression - InitialExpression should evaluate to a Quantity value.
calculatedExpression	http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-calculatedExpression - CalculatedExpression should evaluate to an integer or decimal value (valueQuantity.value). Unit, code and system will default to the unit provided via extension "http://hl7.org/fhir/StructureDefinition/questionnaire-unit"
enableWhenExpression	http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression
rendering-style	http://hl7.org/fhir/extensions/StructureDefinition-rendering-style.html
rendering-markdown	http://hl7.org/fhir/extensions/StructureDefinition-rendering-markdown.html
rendering-xhtml	http://hl7.org/fhir/StructureDefinition/rendering-xhtml
hidden	http://hl7.org/fhir/StructureDefinition/questionnaire-hidden
entryFormat	http://hl7.org/fhir/StructureDefinition/entryFormat
required	item.required
repeats	item.repeats
readOnly	item.readOnly
maxLength	item.maxLength
minLength	http://hl7.org/fhir/StructureDefinition/minLength
regex	http://hl7.org/fhir/StructureDefinition/regex
minQuantity	http://hl7.org/fhir/uv/sdc/StructureDefinition-sdc-questionnaire-minQuantity.html
maxQuantity	http://hl7.org/fhir/uv/sdc/StructureDefinition-sdc-questionnaire-maxQuantity.html
maxDecimalPlaces	http://hl7.org/fhir/StructureDefinition/maxDecimalPlaces
unitOption	http://hl7.org/fhir/R4/extension-questionnaire-unitoption.html
initial	item.initial
enableWhen	item.enableWhen
enableBehavior	item.enableBehavior
text	item.text
unitOption	http://hl7.org/fhir/R4/extension-questionnaire-unitoption.html