> ## Documentation Index
> Fetch the complete documentation index at: https://docs.metriport.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Ratio

> Base StructureDefinition for Ratio Type: A relationship of two Quantity values - expressed as a numerator and a denominator.

## Properties

| Name | Required | Type | Description |
| - | - | - | - |
| id | No | string | Unique id for inter-element referencing |
| extension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations |
| numerator | No | [Quantity](/medical-api/fhir/data-types/quantity) | Numerator value |
| denominator | No | [Quantity](/medical-api/fhir/data-types/quantity) | Denominator value |


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