Answer this question with a simple yes or no. If your certification is not current, assure the interviewer that you are going to renew your certification. If you have an existing, and valid, certification be sure to bring the documentation with you so that the interviewer can take a copy for your file.
"I am CPR Certified. I brought a copy of my card for you to scan, for my file. This certification is valid for another two years."
"I have not yet obtained my CPR certification; however, I am registered to take the CPR course next weekend. I will certainly be certified before my potential start date."
"I have been CPR certified for the past fifteen years. I did notice that my most recent certification is close to expiring so I will be sure to renew this before starting this role."