clinical examination, and EMG findings together. A useful screening method is the determination of the vibrotactile perception threshold.The risk arising from a small carpal canal may be shown by computer- ised tomography and this may help with idiopathic CTS.In subclinical CTS there are nocturnal, short lasting paraesthesias,tingling in the fingers innervated by the median nerve, but no EMG findings. Buchthal et al reported difficulties in the electrophysiological diagnosis of CTS and this emphasises why a diagnosis ofCTS must be based on clinical verification.