Fig. (3) The set-up for the current perception threshold (CPT) test procedure is depicted. The Rapid-CPT values (1 to 25) is obtained from the minimal strength of alternating current (between 0 to 10 mA) stimulus that the patient could detect. The test was performed at the 5Hz frequency on the tip of the middle (D3) and little (D5) fingers, as well as at the shoulder (mid deltoid).