Hand-Held Nerve Conduction Study (NCS)
Limited evidence supports that a hand-held nerve conduction study (NCS) device might be used for the diagnosis of carpal tunnel syndrome.

Rationale
There was one moderate quality study (Tan, 2012) evaluating the use of a hand-held NCS device for the diagnosis of CTS. This study showed that a handheld NCS device can rule in or rule out the diagnosis of CTS, in patients with typical symptoms of CTS, using EDS following AANEM criteria as the reference standard. The hand-held NCS device closely parallels the severity of disease compared with the neurological assessment as well. 

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