According to Miriam-Webster, “expedited” means fast. But in the IRB world, “expedited” means that the research project presents not more than minimal risk and does not have to be reviewed by a Full IRB Committee. The IRB Chairperson or designee can review the submission and has the full authority of the duly-convened IRB with the exception that the Expedited Reviewer cannot disapprove a project. When a reviewer cannot approve a submission under the expedited process, the item is referred to the full board for discussion.
A list of categories of research that are eligible for an Expedited review can be found on the OHRP Website.
Any minor change to previously-approved research may also be eligible for an expedited review, such as new recruitment materials and administrative changes. Generally, non-scientific submissions that do not change the risk/benefit ratio are considered minor changes.