> For the complete documentation index, see [llms.txt](https://guides.ohie.org/arch-spec/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.ohie.org/arch-spec/dev-1/introduction/shared-health-record/retrieve-document.md).

# 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="/pages/-Mj4XggOWpiec6I6h2AJ">Register / Store Document</a> or <a href="/pages/-Me5LoFUIByseApmjarp">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="/pages/-McKUSHxEUfXc--PIcj7">IOL</a> - The interoperability layer that secures and orchestrates the exchange of information </li><li><a href="/pages/-McKShsA0Dd_OOio_-8v">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;

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References:  [WHO DDCC Workflo](https://worldhealthorganization.github.io/ddcc/workflows.html)
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