> ## 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.

# Evidence

> The Evidence resource describes the conditional state (population and any exposures being compared within the population) and outcome (if specified) that the knowledge (evidence, assertion, recommendation) is about.

## Properties

| Name               | Required | Type                                                                            | Description                                                                    |
| ------------------ | -------- | ------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
| url                | No       | uri                                                                             | Canonical identifier for this evidence, represented as a URI (globally unique) |
| identifier         | No       | [Identifier](/medical-api/fhir/data-types/identifier)\[]                        | Additional identifier for the evidence                                         |
| version            | No       | string                                                                          | Business version of the evidence                                               |
| name               | No       | string                                                                          | Name for this evidence (computer friendly)                                     |
| title              | No       | string                                                                          | Name for this evidence (human friendly)                                        |
| shortTitle         | No       | string                                                                          | Title for use in informal contexts                                             |
| subtitle           | No       | string                                                                          | Subordinate title of the Evidence                                              |
| status             | Yes      | code                                                                            | draft / active / retired / unknown                                             |
| date               | No       | dateTime                                                                        | Date last changed                                                              |
| publisher          | No       | string                                                                          | Name of the publisher (organization or individual)                             |
| contact            | No       | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[]                  | Contact details for the publisher                                              |
| description        | No       | markdown                                                                        | Natural language description of the evidence                                   |
| note               | No       | [Annotation](/medical-api/fhir/data-types/annotation)\[]                        | Used for footnotes or explanatory notes                                        |
| useContext         | No       | [UsageContext](/medical-api/fhir/data-types/usagecontext)\[]                    | The context that the content is intended to support                            |
| jurisdiction       | No       | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[]              | Intended jurisdiction for evidence (if applicable)                             |
| copyright          | No       | markdown                                                                        | Use and/or publishing restrictions                                             |
| approvalDate       | No       | date                                                                            | When the evidence was approved by publisher                                    |
| lastReviewDate     | No       | date                                                                            | When the evidence was last reviewed                                            |
| effectivePeriod    | No       | [Period](/medical-api/fhir/data-types/period)                                   | When the evidence is expected to be used                                       |
| topic              | No       | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[]              | The category of the Evidence, such as Education, Treatment, Assessment, etc.   |
| author             | No       | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[]                  | Who authored the content                                                       |
| editor             | No       | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[]                  | Who edited the content                                                         |
| reviewer           | No       | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[]                  | Who reviewed the content                                                       |
| endorser           | No       | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[]                  | Who endorsed the content                                                       |
| relatedArtifact    | No       | [RelatedArtifact](/medical-api/fhir/data-types/relatedartifact)\[]              | Additional documentation, citations, etc.                                      |
| exposureBackground | Yes      | Reference\<[EvidenceVariable](/medical-api/fhir/resources/evidencevariable)>    | What population?                                                               |
| exposureVariant    | No       | Reference\<[EvidenceVariable](/medical-api/fhir/resources/evidencevariable)>\[] | What exposure?                                                                 |
| outcome            | No       | Reference\<[EvidenceVariable](/medical-api/fhir/resources/evidencevariable)>\[] | What outcome?                                                                  |

## Search Parameters

| Name                  | Type      | Description                                                                    | Expression                |
| --------------------- | --------- | ------------------------------------------------------------------------------ | ------------------------- |
| composed-of           | reference | What resource is being referenced                                              | Evidence.relatedArtifact  |
| context               | token     | A use context assigned to the evidence                                         | Evidence.useContext.value |
| context-quantity      | quantity  | A quantity- or range-valued use context assigned to the evidence               | Evidence.useContext.value |
| context-type          | token     | A type of use context assigned to the evidence                                 | Evidence.useContext.code  |
| date                  | date      | The evidence publication date                                                  | Evidence.date             |
| depends-on            | reference | What resource is being referenced                                              | Evidence.relatedArtifact  |
| derived-from          | reference | What resource is being referenced                                              | Evidence.relatedArtifact  |
| description           | string    | The description of the evidence                                                | Evidence.description      |
| effective             | date      | The time during which the evidence is intended to be in use                    | Evidence.effectivePeriod  |
| identifier            | token     | External identifier for the evidence                                           | Evidence.identifier       |
| jurisdiction          | token     | Intended jurisdiction for the evidence                                         | Evidence.jurisdiction     |
| name                  | string    | Computationally friendly name of the evidence                                  | Evidence.name             |
| predecessor           | reference | What resource is being referenced                                              | Evidence.relatedArtifact  |
| publisher             | string    | Name of the publisher of the evidence                                          | Evidence.publisher        |
| status                | token     | The current status of the evidence                                             | Evidence.status           |
| successor             | reference | What resource is being referenced                                              | Evidence.relatedArtifact  |
| title                 | string    | The human-friendly name of the evidence                                        | Evidence.title            |
| topic                 | token     | Topics associated with the Evidence                                            | Evidence.topic            |
| url                   | uri       | The uri that identifies the evidence                                           | Evidence.url              |
| version               | token     | The business version of the evidence                                           | Evidence.version          |
| context-type-quantity | composite | A use context type and quantity- or range-based value assigned to the evidence | Evidence.useContext       |
| context-type-value    | composite | A use context type and value assigned to the evidence                          | Evidence.useContext       |

## Inherited Properties

| Name              | Required | Type                                                   | Description                                            |
| ----------------- | -------- | ------------------------------------------------------ | ------------------------------------------------------ |
| id                | No       | string                                                 | Logical id of this artifact                            |
| meta              | No       | [Meta](/medical-api/fhir/data-types/meta)              | Metadata about the resource                            |
| implicitRules     | No       | uri                                                    | A set of rules under which this content was created    |
| language          | No       | code                                                   | Language of the resource content                       |
| text              | No       | [Narrative](/medical-api/fhir/data-types/narrative)    | Text summary of the resource, for human interpretation |
| contained         | No       | Resource\[]                                            | Contained, inline Resources                            |
| extension         | No       | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations          |
| modifierExtension | No       | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored                      |

To view the FHIR specification for this resource, see [Evidence](https://www.hl7.org/fhir/StructureDefinition/Evidence).