The authors have compared evaluations of the rate of hand skin capillary flow at rest with the results of other studies used in the clinical diagnosis of the vibration syndrome resulting from the hand-transmitted vibrations. Multispecialist medical and auxiliary examinations including the radioisotopic capillary test, have been carried out in 78 patients referred to the Clinic because of suspected vibration syndrome. The values of flow at rest have been taken into account. In 34 patients the flow was slowed down. The lack of correlation between the slowed capillary flow at rest and clinical evaluation of pathological changes indicates a limited usefulness of the isotopic capillary test in the diagnosis of the vascular form of the vibration syndrome due to local vibrations.