Neuropathy, one of the most common diabetes complications, is characterized by highly variable clinical picture. It is not established what evaluation scheme should be applied in the assessment of patient regarding diabetic neuropathy. The validity of various laboratory tests in the diagnosis of diabetic neuropathy also remains unclear. This paper describes different clinical manifestations of diabetic neuropathy and presents the most important methods of assessment of patients with neuropathy suspected based on literature data and authors' observations. Authors highlighted the implications of different methods in diagnostic process. The most valid methods include physical evaluation, determination of vibration sensation and assessment of nerve conduction velocity. The autonomic functions tests have a special role allowing for the diagnosis of autonomic neuropathy.