If your protocol was reviewed and found to be exempt you will only need to update your protocol once every 3 years or if you wish to change the scope of work.
For all other protocols IRB approval is for a maximum period of 1 year. At the end of this period you need to return an annual update form to the IRB requesting a renewal. If you have made significant changes to your research you will need to submit a new protocol.
At any time, if you make changes to your procedures and/or your informed consent document you must inform the Review Board. Sensitive research may need review by the IRB at more frequent intervals. The interval will be determined at the time the protocol is first reviewed.