> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blis.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Updating subject IDs

> Update case IDs, UNOS IDs, and donor IDs for subjects in bLIS.

## Overview

Each subject in bLIS is identified by a **case ID** and can have additional identifiers such as a **UNOS ID** or **donor IDs**. You can update these identifiers from an accession's detail view or from the subject record directly.

## Identifier types

| Identifier   | Description                                                                  |
| ------------ | ---------------------------------------------------------------------------- |
| **Case ID**  | The primary unique identifier for the subject (required)                     |
| **UNOS ID**  | United Network for Organ Sharing identifier, used for organ transplant cases |
| **Donor ID** | Additional identifiers specific to your organization or workflow             |

## Updating identifiers from an accession

<Steps>
  <Step title="Open the accession">
    Navigate to the accession detail view.
  </Step>

  <Step title="Open the actions menu">
    Click the actions menu (three-dot icon) in the accession header.
  </Step>

  <Step title="Select edit donor info">
    Hover over **Edit**, then select **Edit donor info**.
  </Step>

  <Step title="Update the identifiers">
    Modify the case ID, add or remove UNOS IDs and donor IDs, update date of birth or gender as needed.
  </Step>

  <Step title="Save">
    Click **Save** to apply your changes.
  </Step>
</Steps>

## Adding additional identifiers

On the subject edit form, you can add identifiers using the buttons below the existing fields:

* Click **UNOS ID** to add a UNOS identifier (one per subject)
* Click **Donor ID** to add additional donor identifiers (multiple allowed)

Remove an identifier by clicking the minus icon next to it.

## Important notes

<Warning>
  Changing a subject's case ID affects all accessions linked to that subject. Verify the new ID is correct before saving.
</Warning>

* The case ID must be unique across the system
* Changes to subject identifiers are logged in the audit trail
* All accessions for a subject share the same identifiers

## Related

<CardGroup cols={2}>
  <Card title="Subjects" icon="user" href="/concepts/subjects">
    Learn about subject records and the data hierarchy.
  </Card>

  <Card title="Creating accessions" icon="plus" href="/guides/creating-accessions">
    See how subjects are linked during accession creation.
  </Card>
</CardGroup>