---
type: "datatype"
title: "RatioRange"
datatype: "RatioRange"
---
# RatioRange

- [Datatypes](/datatypes)
- [Definitions](/datatypes-definitions#RatioRange)
- [Examples](/datatypes-examples#RatioRange)
- [Mappings](/datatypes-mappings#RatioRange)
- [Profiles](/datatypes-profiles#RatioRange)

## Overview

See also [Examples](datatypes-examples#RatioRange), [Detailed Descriptions](datatypes-definitions#RatioRange), [Mappings](datatypes-mappings#RatioRange), [Profiles](datatypes-profiles#RatioRange) and [Extensions]([%extensions-location%]extensions-datatypes#RatioRange)

A range of ratios of two Quantity values expressed as a low numerator, a high numerator, and a denominator.

The RatioRange datatype should only be used to express a range of ratios if the relationship cannot be suitably expressed using a Range and a common unit. Where the denominator value is known to be fixed to "1", Range should be used instead of RatioRange.

\[%dt RatioRange 6%\]

Common factors in the numerator and denominator are not automatically cancelled out. Ratios are not simply "structured numbers" - for example, blood pressure measurements (e.g., "120/60") are not ratios.

A proper ratio range has one of the numerators and a denominator; however, these are not mandatory in order to allow an invalid ratio with an extension with further information.

**Constraints**

\[%dt.constraints RatioRange%\]

The context of use may require particular types of Quantity for the numerators or denominator.

RatioRange is used in the following places: \[%dtusage RatioRange%\]

## Elements

- **[RatioRange.lowNumerator](/datatypes-definitions#RatioRange.lowNumerator)** [0..1]: [SimpleQuantity](/SimpleQuantity) The value of the low limit numerator
- **[RatioRange.highNumerator](/datatypes-definitions#RatioRange.highNumerator)** [0..1]: [SimpleQuantity](/SimpleQuantity) The value of the high limit numerator
- **[RatioRange.denominator](/datatypes-definitions#RatioRange.denominator)** [0..1]: [SimpleQuantity](/SimpleQuantity) The value of the denominator

## Invariants

- **RatioRange.lowNumerator**: `1`
- **RatioRange.lowNumerator**: `2`
- **RatioRange.highNumerator**: `1`
- **RatioRange.highNumerator**: `2`

## Comments

- **RatioRange.lowNumerator**: If the low element is missing, the low boundary is not known.
- **RatioRange.highNumerator**: If the high element is missing, the high boundary is not known.

## Mappings

- **RatioRange.lowNumerator**: RIM Mapping: ./low
- **RatioRange.lowNumerator**: v2 Mapping: NR.1
- **RatioRange.highNumerator**: RIM Mapping: ./high
- **RatioRange.highNumerator**: v2 Mapping: NR.2