Electrode placement (use the ring electrodes)
- E1 (black): Base of thumb
- E2 (red): 3-4cm distally from E1.
- Ground: Dorsum of hand
Stimulation site
- Two sites
- Radial nerve site
- (-) Cathode (black): 10-cm proximal to E1, along the lateral forearm.
- (+) Anode (red): proximal (in line with the radial nerve)
- Median nerve site
- (-) Cathode (black): 10-cm proximal to E1. Note: Make the 10-cm line to the middle of the wrist crease, then proximal along the median nerve.
- (+) Anode (red): proximal (in line with the median nerve)
- Radial nerve site
Additional Information
- Type of stimulation = Antidromic
- One of the three studies for the combined sensory index (CSI): numb thumb, split ring, P8
- CPT codes for nerve conduction studies
- 95900 Nerve conduction, amplitude and latency/velocity study, each nerve; motor, without F-wave study
- 95903 Nerve conduction, amplitude and latency/velocity study, each nerve; motor with F-wave study
- 95904 Nerve conduction, amplitude and latency/velocity study, each nerve; motor with F-wave study, each nerve; sensory
- 95934 H-reflex, amplitude and latency study; record gastrocnemius/soleus muscle
- 95936 Record muscle other than gastrocnemius/soleus muscle
