> ## 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.

# Distance

> Base StructureDefinition for Distance Type: A length - a value with a unit that is a physical distance.

## 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 |
| value | No | decimal | Numerical value (with implicit precision) |
| comparator | No | code | \< / \<= / >= / > - how to understand the value |
| unit | No | string | Unit representation |
| system | No | uri | System that defines coded unit form |
| code | No | code | Coded form of the unit |


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