Overview
This test evaluates fine discriminative sensation by a patient distinguishing between one or two points of touch
Uses a standardized tool that has pairs of prongs at fixed distances apart, ranging from 2mm to 15mm of separation, along with a single prong
How to administer:
Demonstrate on an area of their skin that is not experiencing sensory dysfunction, such as the other hand
Patient's eyes should be closed
Instruct patient to report "1" or "2" points based on what they feel
Start with the 5mm distance and randomly alternate between using the 1 or 2 points against the patient's skin, working distally to proximally
If 7/10 responses are incorrect in an area, then increase the distance of the prongs using clinical judgement of suspected level of dysfunction (either 1, 2, or 5mm)
Continue testing various areas of the hand and until the smallest distance at which the patient can reliably distinguish two points is determined
Scoring
Normal: <6mm
Fair: 6-10mm
Poor: 11-15mm
Protective: One point perceived
Anaesthetic: No points perceived
Recommended Video
References
Sensory Assessment Workshop Handout. (2012). South Hampton Hand Course. http://www.southamptonhandcourse.org.uk/downloads/2012/SensoryAssessmentWorkshophandout.doc.pdf