Martha's rule, which lets families and patients concerned about their treatment seek a rapid second opinion from medical staff, is already saving lives.
Hundreds of patients have benefited from potentially life-saving changes to their care due to the scheme, which means an urgent clinical review is carried out by a different hospital team if a patient's condition is worsening and they or their family feels they are not getting the care needed.
It was set up after the death of Martha Mills, 13.
She developed sepsis while at King's College Hospital in London in 2021.
A coroner ruled she would likely have survived if doctors had identified her deteriorating condition and transferred her to intensive care earlier.
