Final answer:
The L2 dermatome should be tested for sensory perception using a cotton-tipped applicator, with testing done in the medial and upper thigh area. Sensory perception should be assessed at both distal and proximal locations to check for impairments.
Step-by-step explanation:
To test for the L2 dermatome, a light touch stimulus using the soft end of a cotton-tipped applicator should be applied to the skin area innervated by the L2 spinal nerve. This area generally corresponds to the medial and upper part of the thigh. The stimulus should be applied in both distal and proximal locations, examining for any differences in sensory perception that might suggest a sensory nerve impairment. For the sensory exam, it's also important to consider other modalities, such as pain, tactile movement, proprioception, and two-point discrimination, to assess the spatial specificity of perception and potential pathway deficits.