What can I do to prevent my shipments from revealing unblinding information to site users?

When you specify supply settings for a study, you indicate whether a shipment can contain only one kit. If the study is blinded, you typically do not allow a shipment to contain only one kit.

If you choose supply settings that don't allow single kit ordering, or if the kits in your study use different packaging or have different storage requirements, you should create blinded groups. Blinded groups determine the kit or kits that are added to a shipment to protect the study blind.