Services across England and Wales affected, but life-threatening calls will be responded to.
Image source, EPAAmbulance staff across most of England and Wales will go on strike on 21 December in a dispute over pay.
The coordinated walkout by the three main ambulance unions – Unison, GMB and Unite – will affect non-life threatening calls only.
But it could mean people who have had trips and falls not being responded to.
It comes as Royal College of Nursing members are also preparing to go on strike on 15 and 20 December in parts of England, Wales and Northern Ireland.
The impact of the walkout will be patchy as Unison, which has twice the numbers of the other two unions combined, only has a strike mandate for half of England’s 10 regional services.
The walkouts will involve paramedics as well as control room staff and support workers, with the military on standby to help out.
The only service which will be completely unaffected, however, is the East of England.
The full extent of the cover striking staff will provide has yet to be decided – detailed negotiations will take place between local ambulance bosses and unions ahead of the walkout.
Under trade union rules, life-preserving care has to be provided so the two highest category calls – covering everything from heart attacks and strokes to major trauma – will still be responded to.
Last month the Association of Ambulance Chief Executives warned patients were dying because of the “crippling delays”. ambulance crews faced when they arrive at A&E.
Unison head of health Sara Gorton said: “The government will only have itself to blame if there are strikes in the NHS before Christmas.
“Ambulance staff and their health colleagues don’t want to inconvenience anyone. But ministers are refusing to do the one thing that could prevent disruption – that’s start genuine talks about pay.
“Wages are too low to stop health workers quitting the NHS. As more and more hand in their notice, there are fewer staff left to care for patients. The public knows that’s the reason behind lengthy waits.”
All the unions have asked for above-inflation pay rises.
But the governments in England and Wales have given NHS staff an average rise of 4.75%, with staff guaranteed a minimum of £1,400.
England Health Secretary Steve Barclay said paying what was being asked for was “unaffordable” and he has pointed out the award met the requirements of the recommendations of the independent NHS Pay Review Body.
About half of ambulance staff are members of one of the three unions.
The last time ambulance staff were involved in strike action was in 2014.