---
title: "List changes"
method: GET
path: "/changes"
tags: ["Tracking changes"]
---

# List changes

`GET /changes`

Whenever Orthanc receives a new DICOM instance, this event is recorded in the so-called _Changes Log_. This enables remote scripts to react to the arrival of new DICOM resources. A typical application is auto-routing, where an external script waits for a new DICOM instance to arrive into Orthanc, then forward this instance to another modality.

## Query parameters

- `limit` number
- `since` number

## Response `200`

- object — The list of changes
  - `Changes` object[] — The individual changes
  - `Done` boolean — Whether the last reported change is the last of the full history
  - `Last` number — The index of the last reported change, can be used for the `since` argument in subsequent calls to this route

---

[API](https://skmtc.net/orthancserver/apis/orthanc-server.md) · [All operations](https://skmtc.net/orthancserver/apis/orthanc-server/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/orthancserver/orthanc-server/revisions/af646f6f871b/schema)