two-point discrimination
A clinical test measuring tactile sensory function by determining the minimum distance between two stimuli that can be perceived as separate points.
Full Definition
Two-point discrimination is a quantitative measure of tactile sensory function that assesses the ability to distinguish between two simultaneous point stimuli applied to the skin. This test is crucial in evaluating digital nerve function following hand injuries or surgical repairs. Normal values vary by location, with fingertips typically demonstrating 2-4mm discrimination distance. The test can be performed as static two-point discrimination (stationary stimuli) or moving two-point discrimination (moving stimuli across the skin). Results help determine the success of nerve repairs and guide rehabilitation protocols in hand therapy.
Usage
Usage note: Results should always include measurement units (mm) and specify static vs. moving testing.
In Context
- "Two-point discrimination improved from 15mm to 6mm at six months following digital nerve repair." — Follow-up examination
- "Static two-point discrimination was normal at 3mm in all digits except the injured index finger." — Sensory assessment report