Search for your name on the Michigan CNA Registry and see if the expiration date for your license was updated or contact Prometric at 800-752-4724. Please note that your certificate needs to be renewed prior to your expiration date listed on your current certificate. Prometric will send a renewal notice 45 days prior to your expiration date. If the renewal form is not submitted timely, or is incomplete, the certificate will lapse and you may not work as a CNA until the required paperwork has been received by Prometric and made active again. The renewal notice must be received by Prometric prior to the expiration date.