Despite the present development of instrument techniques for diagnosis, clinical procedures still remain valid. It is for this reason that, for the past fifteen years, we have continued to use an almost forgotten test: percussion of the veins. Opinions concerning this test and its technical description being contradictory in the literature, we sought to define the exact circumstances under which it should be used, and how to apply it. Our diagnostic results were favorable, the technique simple, and our study was aimed mainly at describing its merits.