Thank you for posting your query.
A scale of 7 out of 15 indicates a severe head injury
, and only 20% people have good neurological recovery in this condition.
As of now (even after two weeks), your friend is unconscious (responding only to painful stimuli). This also indicates a poor chance of good meaningful recovery.
For predicting a proper prognosis, investigations such as EEG and evoked potential studies are useful, so is the PET scan of the brain.
Dr Sudhir Kumar MD DM (Neurology)