Oxygen

Ensure the supply of oxygen contained in the practice’s oxygen cylinders will enable adequate flow rates (15 litres/minute) to be maintained until the arrival of the ambulance or the patient recovers fully (at least 30 minutes supply).

A full size D cylinder contains nominally 340 litres of oxygen and therefore should provide oxygen for up to ~22 minutes
A full size CD cylinder contains nominally 460 litres of oxygen and therefore should provide oxygen for up to ~30 minutes
A full size E cylinder contains nominally 680 litres of oxygen and therefore should provide oxygen for up to ~45 minutes

For rural practices, it may be prudent to retain two size E cylinders to allow for longer ambulance response times.