The country's district health boards are trying to avoid nurse strikes despite pay negotiations breaking down.
The boards and the New Zealand Nurses' Organisation have asked for urgent facilitation through the Employment Relations Authority (ERA).
Mediation between the two groups ended last night without agreement on a revised offer.
The ERA could recommend a settlement.
Meanwhile, health boards were continuing to make contingency plans to ensure emergency and essential services were available if the strike went ahead, spokeswoman Helen Mason said.