REDCap 15.5.15 LTS New Features Improvements Changes

WashU REDCap upgrade information

Version: 15.5.15
Release date REDCap LTS: 2025-07-31

Available at WashU date: 2025-10-16

This page contains descriptions of new features, improvements, and changes that are included in the upgrade to REDCap 15.5.15 planned for October 16, 2025, at 8 p.m. Click the links below to see a description of all new features added during this upgrade.

Page Heading Desription

Each page contains the following information:

Version: earliest version the feature was available in REDCap
Release date REDCap Standard: earliest date feature available to institutions on REDCap standard

Release date REDCap LTS: earliest date feature was included in LTS software release, i.e., earlier potential date for WashU and other institutions on REDCap LTS to upgrade to version that included the feature

Available at WashU date: date WashU upgraded to version that included this feature

This information is provided so to show the difference between the original release of the feature and when it became available at WashU, and so users can understand why some features may be available at other institutions before WashU.

Why does WashU REDCap use the LTS version?

The LTS version of REDCap is generally considered to be more stable (i.e. less buggy) than the standard release. This is mainly because it receives new features/functionality at a lower frequency, in which it is thought that new features also inadvertently introduce more bugs. The extent to which LTS is more stable varies over time, but it could be said that LTS is "slightly" or "moderately" more stable than the standard release, given its historical track record. This does *not* imply that the standard release is not stable in any way. However, given the size of the WashU REDCap instance and the nature of the projects, we believe it is best to use the LTS version to reduce operational disruptions due to increased bugs.