# Retrieve Document

This transaction can be used to retrieve documents from a SHR or document repository that stores health records.  In addition, a vaccine verifier (point-of-care application or any authorized application outside of the HIE) can use this transaction to  verify a Digital Documentation COVID Certificate (DDCC) Immunization event.  This may include COVID immunizations and negative tests.  

| **Workflow Maturity**         | <p><img src="https://lh6.googleusercontent.com/Kxkqfa92YGW3mIOmWio0Twi4YLMA92z6mL1MuFzkx4AWS5CX5zbzWid5z4p2W-e6O66llKpaU0r6lzwyXfhbIiWmkVEuPDy6stX5x5L8uC2DkEXs6qUFX-7xxXTlb9hbkg" alt=""></p><p><strong>Newly Defined</strong></p> | <p></p><ul><li><strong>Workflow is defined by WHO and has OpenHIE ARB approval</strong></li><li><strong>Initial implementations are being considered.</strong>  </li></ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| ----------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Standards                     |                                                                                                                                                                                                                                     | <p></p><ul><li>The Retrieve Health Certificate transaction is based on <a href="https://profiles.ihe.net/ITI/MHD/ITI-68.html">MHD's Retrieve Document transaction \[ITI-68]</a>. It can be used to verify the contents of a DDCC Immunization event.</li></ul>                                                                                                                                                                                                                                                                                                                                                                                                     |
| Assumptions and Prerequisites |                                                                                                                                                                                                                                     | <p></p><ul><li>The appropriate trust agreements and processes have been put in place for the document requester or Verifier to receive the certificate.   </li><li>The appropriate documents or meta data about the document have been stored.  This may include saving a vaccine or a lab test event to a shared health record via <a href="broken-reference">Register / Store Document</a> or <a href="save-patient-level-clinical-data-workflow">Save Patient-level Clinical Data Workflow</a>. </li></ul>                                                                                                                                                      |
| Actors                        |                                                                                                                                                                                                                                     | <p></p><ul><li>Document Requester or Verifier (External System) - External system or Point-of-care system requesting the document or  vaccine status.  </li><li><a href="../../openhie-component-specifications-1/openhie-interoperability-layer-iol">IOL</a> - The interoperability layer that secures and orchestrates the exchange of information </li><li><a href="../../openhie-component-specifications-1/openhie-shared-health-record-shr">SHR </a>/ Document Repository (or Electronic Vaccination Registry) - The shared health record that serves as a centralized data store for patients’ longitudinal health record and or health documents</li></ul> |

### Interaction Description

The Interaction Description is stored in the ["Retrieve Health Certificate Reference" in the WHO FHIR IG](https://worldhealthorganization.github.io/ddcc/transactions.html). &#x20;

{% hint style="success" %}
References:  [WHO DDCC Workflo](https://worldhealthorganization.github.io/ddcc/workflows.html)
{% endhint %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://guides.ohie.org/arch-spec/dev-1/introduction/shared-health-record/retrieve-document.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.