The restructuring has been disruptive and is the third in the past decade, staff said.
Wairarapa Hospital manager Steve Crew said the DHBs were looking for ways to cooperate and better service is what people need.
The DHBs were trying to work more closely together and the information and communications technology (ICT) team was the next to be examined, said Graham Dyer, Hutt Valley and Wairarapa DHB Chief Executive.
"A single ICT makes sense, we have a single planning team."
He said change was always disruptive.
"There have been questions, whenever there is a change you risk losing good people.
"And yes, there is uncertainty when you introduce change, you do get rumours and you do get suspicions," he said.
Senior staff expressed concern that patients may end up having to travel to other hospitals for surgical services.
This could be risky if patients are in a critical condition, they said.
Mr Dyer was adamant no services would be cut from Wairarapa.
"There are no plans to cut services or move services."
"There have never been plans to cut services, but there are plans to change how we deliver services."
"It's something that we will look at over time."
He said that some services would actually be coming to Wairarapa, although he could not reveal what at this stage.
Many services already require patients to travel outside of Wairarapa but comprehensive orthopaedic, gyneacology, maternity, and general surgeries are available at Wairarapa Hospital.
These comprehensive services are not going to go anywhere else, said Mr Dyer.
Mr Crew said the vision for the 3DHB was about the most appropriate hospital for the most appropriate care.
"We need to integrate our services, we have done it unofficially for years."
Wairarapa DHB had been in the red in the 2012 financial year with a $4.3 million deficit.
A $3.3 million deficit was forecast for the 2012/13 year.
Mr Dyer said they had already saved $1.2 million.
"Some of that deficit reduction is through management restructure, some through sharing resources."
The cost of transporting patients to other hospitals was expensive, he said.
"We are at risk on that."
Mr Crew expects costs to go up because of Wairarapa's ageing population.
"We do have a disproportionate level of demand from that population"
He said preventative measures and early intervention were key.
Collectively, the three DHBs will receive around 1.5 billion dollars in 2013/14, a $15 million increase on 2012/13.
The three DHBs have committed to a $7.2 million deficit position across their collective catchment for 2013/2014, and aim to break even in future.
