Family members will only be allowed to accompany loved ones in ambulances in "exceptional circumstances" during the nation's Covid-19 response.
St John has announced the change around emergency ambulance transportation of patients today in a bid to "limit the spread of Covid-19 and to keep patient families and health workers safe".
Ambulance officers across the country have been informed of the change.
"While St John understands that patients often like to have a support person accompany them on the ambulance journey, it is necessary to limit the number of people in emergency departments during the current Covid-19 pandemic response," St John Medical Director Dr Tony Smith said in a statement.
"We understand that this initiative may be distressing for patients and families in an already stressful situation but appreciate the public's help with keeping everyone safe."