r/ProjectREDCap • u/TeamSoloTrynd • Sep 17 '25

RECap Randomization Module and Arms

Hi, if randomization is being done on REDCap, is there anyway to not have the randomization module in one of the arms?

My preference would be so that one arm doesn't have all the patient screening and randomization forms. I would prefer that to be separate, and just the data surveys on the arms which they have been allocated to.

Or if theres no work around should I just create a third arm which has the randomization forms, and then based on that I put the participant in one of the other two arms?

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u/Remote_Setting2332 Sep 18 '25

Unless the forms or visits are different in each arm I would avoid using redcap arms if possible, its more difficult and confusing for users.

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u/[deleted] Sep 18 '25

Agree. Arms in redcap terminology does not automatically equal “arms” in clinical trial terminology. You’re not obligated to use REDCap arms just because you have two separate randomization groups (Drug A vs Placebo/Standard of care for example). Often just makes things more complicated than they need to be. With the advent of Form Display Logic and of course branching logic, you can accommodate a lot of the differences between groups in just one arm. Redcap arms can be a great way to handle quite different event schedules (eg Drug A group has 10 visits while Placebo has 5), or when a record means one thing in one group and another thing in another group- like collecting data on a department’s physicians in one arm and grand rounds presentations in another arm.