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two point discrimination test
Using 1 or 2 simultaneous pinpricks, find the distance at which the patient can distinguish 1 versus two pinpricks.
The normal distance varies in different parts of the body.
1 mm on the tongue
2-8 mm on the fingertip
40 mm on the chest & forearm
75 mm on the upper thigh & upper arm
General
physical examination technique
References
DeGowin & DeGowin's Diagnostic Examination, 6th edition,
RL DeGowin (ed), McGraw Hill, NY 1994, pg 806, 807