Table 1.

Definition of Electrophysiological Diagnostic Outcomes

Outcome^*	Median Nerve^†		Ulnar Nerve^†		Combined MUD
Outcome^*	DML	DSL	DML	DSL	Combined MUD
Normal	Normal	Normal	Normal	Normal	Normal
CTS^‡	Abnormal	Abnormal	Normal	Normal	Abnormal
Ulnar^§	Normal	Normal	Abnormal	Abnormal	Normal
Nonspecific^¶	Abnormal	Abnormal	Abnormal	Abnormal	Normal

* Normal, no neuropathy; CTS, carpal tunnel syndrome; ulnar, ulnar neuropathy; nonspecific, nonspecific upper extremity neuropathy affecting both median and ulnar nerves.
† DML, distal motor latency; DSL, distal sensory latency; MUD, median-ulnar distal sensory latency difference; normal DML or DSL, <97.5% of reference population; normal MUD, <90% of reference population; MUD threshold percentile lower than DML and DSL to match clinical practice.
‡ One of median nerve DML, median nerve DSL, or MUD must be abnormal.
§ One of ulnar nerve DML or DSL must be abnormal.
¶ One of median nerve DML or DSL must be abnormal and one of ulnar nerve DML or DSL must be abnormal.