Quantity
This element is meant to denote quantities of items such as medications. The unit of a dose can be expressed with NCIT terms such as Milligram, Microgram, or Unit. The value should be expressed as a number.
Data model
Field |
Type |
Multiplicity |
Description |
---|---|---|---|
unit |
1..1 |
The kind of unit. REQUIRED. |
|
value |
double |
1..1 |
the value of the quantity in the units e.g. 2.0 mg. REQUIRED. |
reference_range |
0..1 |
the normal range for the value |
Examples
The following message could be used to represent the quantity corresponding to a 15 mg tablet of Meloxicam.
unit:
id: "NCIT:C28253"
label: "Milligram"
value: 15.0
The following message could be used to represent the quantity corresponding to a bolus of 5000 units of Heparin.
unit:
id: "NCIT:C44278"
label: "Unit"
value: 5000
The following example shows a quantity for a platelet count per microliter, with a reference range.
unit:
id: "UO:0000316"
label: "cells per microliter"
value: 300000.0
referenceRange:
unit:
id: "UO:0000316"
label: "cells per microliter"
low: 150000.0
high: 450000.0
Explanations
unit
Ontology terms for units can be taken from the National Cancer Institute Thesaurus (NCIT), from the subhierarchy for Unit of Measure (Code C25709).
value
The corresponding value of the quantity in the indicated units.