Waiheke residents with health issues - including some with chronic conditions - say they are living in fear of what could happen without after-hours care on the island.

Over 9000 residents live on the island and currently have to use telehealth or call an ambulance in an emergency after Waiheke's only after hours clinic - Oranga After Hours - closed unexpectedly about a fortnight ago.

Health New Zealand officials are due to visit the island on Wednesday to talk to providers about the future of after hours care on the island, and the Waiheke Medical Centre - owned by the Piritahi Hauora Trust - said it would be launching a new service.

The centre has opened over the past few weekends to help people during this transition, but until a clear plan is in place, there will be no doctor after 5pm on weekdays or on weekends.

Long-time resident Lisa Thomas, who has Crohn's disease and is anaphylactic, said she relied on the after hours services.

Following a surgery she had for Crohn's disease, Thomas had many unpredicted infections and said she needed "a lot of support" and would be going to the doctors at all hours.

Thomas has also had several close calls after being stung by bees or wasps in the past, where she has either needed urgent care or monitoring after using an EpiPen.

She fears that ambulance services will be stretched when they become the only in-person medical service on call.

"For my anaphylaxis, now I would call an ambulance because it's so time precious but if the ambulance service is looking after everyone else, the chances of them getting to me within five minutes are really small.

The anaphylaxis is really time critical, I need people right there and that's a bit scary," she said.

She said the health services on Waiheke were inadequate, and that it was unfair that people who had chronic conditions or needed cancer treatment would need to potentially consider moving off the island.

"It's so crap what's provided for 9000 people, so it would be really good if they can look at what the problems are rather than the money," she said.

A paramedic on Waiheke told RNZ there was one paramedic and one emergency medical technician based on the island, just enough to operate one ambulance.

St John ambulance said it had eight ambulance staff for Waiheke but would not say how many of them lived on the island.

Seventy-five-year-old Ian Bode is also among those nervous about what the cut in service could mean for his safety.

He is waiting for a heart valve surgery and feels unsafe about recuperating on the island.

"The fact that I will come back to Waiheke post operation - if there's a lack of support on the island, that would concern me… you wanna know you got access to appropriate medical care if that's necessary," he said.