In general, the currently approved protocol remains “current” for purposes of enrollment and participation in a study until a new version of the protocol (and any subsequent modifications to the informed consent document) is approved by the IRB. Depending on the study, protocol changes may affect only new subjects, or they may also apply to previously enrolled subjects also. You should check with the study sponsor and IRB as to which subjects are impacted by any protocol modifications, such as those you describe below.