> ## 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                             |