Archie Battersbee's mum has released a video of her son she claims provides 'new' evidence he is still breathing.
Hollie Dance insists 12-year-old Archie is able to breathe independently of a respirator as the Christian Legal Centre - which is supporting the family's case - circulated a video which they want to submit as evidence.
The clip shows Archie on an emergency room monitor displaying his respiratory rate - which is set by a ventilator.
At the start of the footage, the respiratory rate increases from 14 to 15 before a diagram of a pair of lungs flashes- which can be an indicator that a person has initiated a breath.
It comes after doctors treating Archie at the Royal London Hospital in Whitechapel, east London, say he is brain-stem dead and will not be able to wake up.
They believe continued life-support treatment is not in his best interests.
Doctors can lawfully turn off Archie Battersbee 's life support, despite the father being rushed to hospital, appeal judges have ruled.
Yesterday a ruling found that medical staff had seen "no signs of life" in the 12-year-old schoolboy.
His parents, who are separated, have fought a legal battle to keep Archie’s ventilator turned on.
A lawyer representing Archie's parenting tried to get the ruling postponed following revelations that the 46-year-old believes her son had tried to breathe independently and his dad Paul Battersbee, 56, had been rushed to hospital.
The judges refused to delay yesterday's decision.
Sir Andrew McFarlane, the president of the Family Division of the High Court and the most senior family court judge in England and Wales, said in a detailed ruling that medical staff had seen "no signs of life" in Archie.
He said the case had received widespread media coverage - including a photograph of Archie.
Sir Andrew said: "Archie is no longer the boy in the photograph. He is someone whose every bodily function is now maintained by artificial means."
Appeal judges also said they would temporarily pause today's ruling for 48 hours, to give the family time to approach the European Court of Human Rights to consider the case.