Some people's non-urgent public hospital appointments or elective surgery will be postponed tomorrow.
Nurses Organisation members will be on strike from 11am to 7pm , as they seek more pay and better staffing levels.
District Health Boards spokesman Jim Green told Mike Hosking it will be disruptive to the public and services.
“So, we have to really focus in on that at present to make sure that we keep things for people over that period of time. We’ve been doing that work over the last three weeks now to make sure that we’re ready.”
Jim Green says DHBs hope to speak to nurses again on Thursday, when they'll get back to listening, talking and resolving this.