Final answer:
To test for vibration sensation in diabetic neuropathy, a neurologist would use a tuning fork placed on the interphalangeal joint of the right big toe.
Step-by-step explanation:
To test for vibration sensation in diabetic neuropathy, a neurologist would use a tuning fork. They would place the tuning fork (128Hz) on the interphalangeal joint of the right big toe. The patient would then indicate if they can sense the vibration. This test helps assess the function of the sensory nerves in the feet, which can be affected by diabetic neuropathy.