Boris Johnson could be given up to four litres of oxygen and specialist breathing aids as he battles coronavirus in intensive care.
The Prime Minister could be given specialist medical support tailored to fight the virus- such as the aid known as continuous positive airway pressure (CPAP) - as he fights the virus in London's St Thomas' Hospital.
Johnson, 55, could be set for the invasive procedure, which bridges the gap between an oxygen mask and full ventilation, reports Birmingham Live.
Mr Johnson could also have blood and samples from his throat collected according to guidance issued to doctors fighting Covid-19 by the World Health Organisation (WHO) last month.
The PM remains in intensive care (ICU) this morning after a second night battling persistent Covid-19 symptoms, senior Cabinet Minister Michael Gove confirmed this morning.
A doctor told the Times the PM PM had not been put on a ventilator or intubated - which entails putting a tube in the windpipe to aid breathing - but he was given oxygen.
Sources told the newspaper Mr Johnson required around four litres of oxygen rather than the 15L used by an average Covid-19 ICU patient.
The PM was first admitted 10 days after testing positive for the bug - 'as a precaution', Number 10 officials said.
Mr Johnson was then shifted into St Thomas' Hospital's ICU last night after his condition and was given oxygen last night, in what Downing Street said was a precautionary measure.
He had been self-isolating for days, but his illness - said to have included a hallmark Covid-19 cough - had persisted, leading to his hospital admission.
Experts have described the kinds of treatments and breathing supports used at hospitals around the world to treat coronavirus patients at the intensive stages.
One is CPAP, which uses pressure to send a blend of air and oxygen into the mouth at a steady rate, thereby boosting the amount of oxygen that enters the lungs,
Many Covid-19 patients eventually "progress to invasive ventilation", which is for people whose illness is so severe they are struggling or unable to breathe for themselves.
A mechanical ventilator either does all the breathing for the patient, or assists the patient's own breathing.
The patient is heavily sedated while a device called an endotracheal tube (ET) is guided through the mouth into the windpipe.
Heavy sedation is then continued because having a tube in the throat can be very uncomfortable.
Patients can be fed at the same time through a tube going into their stomach via their nose.
The PM is likely to have already undergone several tests to check his oxygen levels, white blood cell count, and liver and kidney function before he is released from hospital following his admission over Covid-19, according to doctors.
He is also likely to undergo an electrocardiogram to check his heart.
GP Dr Sarah Jarvis told the BBC shortly after he the PM admitted on Sunday that Mr Johnson would also have his chest X-rayed and lungs scanned, particularly if he was found to be struggling for breath.
Hours before his transfer to ICU last night the PM, who tested positive for Covid-19 on March 26, wrote that he was in "good spirits" and praised the care he was receiving.
