A nurse told me that when a doctor or nurse has a meeting with a patient that he or she makes a judgement as to what he or she considers is the frailty score at that time, recognising that it is a snapshot at the time and can vary.
Apparently there are two values, one for physical, one for mental.
So, for example, if someone needs to go to the dentist, the physical score is a guide as to whether the person would need supported transport, the mental score is whether the person can make the telephone calls and arrange it or would need help from someone to get it arranged.
It is recognised that frailty score is just a general indication, for example someone could be at 3 for some things, 4 for some things and 5 for a few things, just depending upon his or her particular circumstances.