To determine the GAF score, go down  the GREEN section of the Psychological functioning sub-scale until you find the correct number range  (e.g. 71-80)  descriptor or determine that the symptom severity is not in that section.   You would then repeat for the YELLOW and, if necessary, the RED sections until you find the correct  number range for the Psychological  section. 

Once you identify the number range for  the  Psychological sub-scale, go to the corresponding number range on the Social/Occupational sub-scale. If the dysfunction of the Social/Occupational sub-scale is within or better than the corresponding  Psychological sub-scale number range, your GAF score comes from the identified  Psychological  sub-scale number range. If the Social/Occupational sub-scale  dysfunction is worse, than you continue down Social/Occupational  sub-scale until you find the correct number range.  The GAF score comes from this LOWEST number range.  

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Psychological  

(e.g.  depression, psychosis, suicidal ideation, communication disorders)

91-100 No Symptoms

81-90    Absent or minimal symptoms

71-80    Limited or expectable reactions

61-70    Mild symptoms

51-60    Moderate symptoms

41-50    Serious symptoms

31-40    Some impairment  (in reality testing or communication)

21-30    Behavior is considerably influenced by delusions or hallucinations OR serious impairment in communication or judgment.

11-20    Some danger of hurting self or others

1-10    Persistent danger of severely hurting  of self or others

Social/Occupational

(eg. school problems, can't keep a job, fights, poor personal hygiene)

91-100   Superior in all areas        

81-90     Good; just "every day" problems

71-80   No more than slight impairment

61-70    Some difficulty but functioning pretty well

51-60   Moderate difficulty

41-50   Serious impairment

31-40    Major impairment in several areas (such as work, school, family relationships)

21-30     Inability to function in almost all areas

11-20  Occasionally fails to maintain minimal personal hygiene

1-10   Persistent inability to maintain minimal personal hygiene OR serious suicidal act with clear expectation of death.