# Creating Patient/Series/Study/Instance IDs?

**URL:** https://discourse.orthanc-server.org/t/creating-patient-series-study-instance-ids/640
**Category:** Google Groups archive
**Created:** [March 23, 2017, 7:18pm UTC](https://discourse.orthanc-server.org/t/creating-patient-series-study-instance-ids/640 "2017-03-23T19:18:20Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Derek\_Merck](https://discourse.orthanc-server.org/letter_avatar_proxy/v4/letter/d/839c29/32.png) [@Derek\_Merck](https://discourse.orthanc-server.org/u/Derek_Merck)
#### Post date: [March 23, 2017, 7:18pm UTC](https://discourse.orthanc-server.org/t/creating-patient-series-study-instance-ids/640/1 "2017-03-23T19:18:20Z")

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I am indexing my PACS and want to assign orthanc-like identifiers to studies in the PACS that orthanc is not (currently) managing. Ideally those identifiers would be persistent if I do pull them over into orthanc at some later point. Is orthanc’s algorithm for hashing series/study/instance/patient IDs described anywhere so I could pre-compute them?

Derek-

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### Author: ![Thibault\_Nelis](https://discourse.orthanc-server.org/letter_avatar_proxy/v4/letter/t/48db29/32.png) [@Thibault\_Nelis](https://discourse.orthanc-server.org/u/Thibault_Nelis)
#### Post date: [March 24, 2017, 8:45am UTC](https://discourse.orthanc-server.org/t/creating-patient-series-study-instance-ids/640/2 "2017-03-24T08:45:07Z")

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You may find the relevant information here:  
[http://book.orthanc-server.com/faq/orthanc-ids.html](http://book.orthanc-server.com/faq/orthanc-ids.html)

Don't hesitate if you need more details.