Health Secretary Patricia Hewitt has vowed to press ahead with plans to merge West Midlands Ambulance Service with neighbouring services, despite objections from MPs.
She revealed the new service, created by merging four ambulance trusts, will be called "West Central Ambulance".
Yesterday she launched a public consultation on the proposals, which will last for 14 weeks.
However, the merged service is the only option on the table. The plans have been attacked by MPs, including some of her own Labour colleagues.
Staffordshire backbenchers yesterday presented a petition signed by more than 3,000 residents urging the Government to scrap the proposals.
The West Midlands region is currently covered by four ambulance trusts - West Midlands, Hereford & Worcestershire, Coventry & Warwickshire and Staffordshire.
But these are to be replaced by one giant ambulance service covering five million people. Similar mergers are planned for the fire and police services.
Health Minister Lord Warner defended the reforms, saying larger ambulance trusts would have the infrastructure to deliver a higher standard of care.
By cutting down on duplication in "back room" functions such as administration, they will also be able to invest more in front-line services, he said. And a larger service would have the resources to respond successfully to a major incident, he said.
Lord Warner said: "There would be no reduction in ambulance vehicles, or front-line staff.
"Instead a reorganised service will mean less bureaucracy, more money to invest in front line services and a better deal for patients.
"Response times for life-threatening situations will not be affected other than to continue to improve."