Katz hand diagram classification of carpal tunnel syndrome

ClassicSymptoms include pain, numbness, tingling, and burning in at least 2 digits (thumb, index, and long)Involvement of the fourth and fifth digits, wrist, and area proximal to the wrist is allowed
Involvement of the palm or dorsum of the hand is not allowed
ProbableSymptom pattern same as classicPalmar symptoms are allowed unless confined to the ulnar side
PossibleSymptoms involve only 1 digit (thumb, index, or long)Symptoms may involve the dorsum of the hand
UnlikelyNo symptoms involving thumb, index, or long digit