--- title: Switching A Participant's Arm In A Protocol description: Guidance for changing a participant’s study arm, updating enrollment records, and managing active arm status in Vestigo. --- [Skip to content](https://vestigohelp.mccreadiegroup.com/en/knowledgebase/switching-a-participants-arm-in-a-protocol#main-content) English Show submenu for translations [![Vestigo-Logo-Md-1](https://vestigohelp.mccreadiegroup.com/hs-fs/hubfs/Vestigo-Logo-Md-1.png?width=239&height=75&name=Vestigo-Logo-Md-1.png)](https://vestigohelp.mccreadiegroup.com/en/vestigo?hsLang=en) Open main navigation Close main navigation - English Show submenu for translations - - [Contact Us for Support](https://vestigohelp.mccreadiegroup.com/en/knowledgebase/contacting-support) [Contact Us for Support](https://vestigohelp.mccreadiegroup.com/en/knowledgebase/contacting-support?hsLang=en) What can we help with? - There are no suggestions because the search field is empty. 1. [Vestigo Help Center](https://vestigohelp.mccreadiegroup.com/en/knowledgebase?hsLang=en) 2. [Protocols](https://vestigohelp.mccreadiegroup.com/en/knowledgebase/protocols?hsLang=en) 3. [Participants and Enrollments](https://vestigohelp.mccreadiegroup.com/en/knowledgebase/protocols?hsLang=en#participants-and-enrollments) September 25, 2026 # Switching A Participant's Arm In A Protocol ## Guidance for changing a participant’s study arm, updating enrollment records, and managing active arm status in Vestigo. Changing arms may be necessary when participants move from one arm to another and sites are managing them separately. This may be done because certain orders are only available in certain arms, or maybe the arms are setup as Blinded and Open Label Extension. Managing participants in a protocol is done on the Patients/Subjects tab of the Protocol Snapshot.  On this tab, you will see a list of participants currently enrolled in the protocol and links to modify certain parts of the participant’s enrollment.  ### Required Permissions **ViewPatientSubjects** - View patient/subjects in a protocol. Protocol Snapshot permissions are required **EnrollPatients** - Ability to enroll patients into a protocol **EditPatientEnrollment** - Allows the user to edit the patient study number and the date of enrollment for a given patient/subject enrolled in a protocol   1. Navigate to the **Protocol** 2. Click on the **Patient/Subjects** Tab 3. Click on the **Edit Enrollment** link for the appropriate participant 4. Scroll down and locate the **Enrollment Arm** drop down menu and select a new Enrollment Arm![](https://vestigohelp.mccreadiegroup.com/hs-fs/hubfs/image-png-Sep-14-2026-05-04-04-7102-PM.png?width=670&height=250&name=image-png-Sep-14-2026-05-04-04-7102-PM.png) 5. The screen will expand and show additional options 6. Users can change the **Patient Study Number** (PSN) for the new arm or leave as is. In most cases, this will remain the same. 7. (Optional) Adjust the **Date Enrolled** 8. (Optional) If the participant is to only be enrolled in the new arm, leave the **Inactivate Current Arm?** checked. If the participant is to remain enrolled in the original arm, uncheck this flag 9. Click the blue **Submit** button **Caution** - If a PSN is entered that already exists on the protocol, the user will see a validator message indicating *the entered Patient Study Number is already in use on the selected arm. 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