Contingency planning meetings have been held regularly since the Lakes District Health Board received notice of the planned nurses' strike.
There are eight hours of strike action by the New Zealand Nurses Organisation planned for Wednesday, June 9.
In a statement, the DHB said contingency planners were working closely with managers and clinical leaders on "ensuring the continuing provision of essential emergency services including acute surgery, emergency department care, intensive care, and maternity care".
The strike is scheduled to start at 11am and finish at 7pm, meaning it will cover two nursing shifts.
All elective surgery cases and nearly all outpatient clinics are being deferred for the day of the strike. Those people whose procedures and appointments are being deferred are being contacted individually by the Lakes DHB.