DIAGNOSTIC TESTING FOR ENDOLYMPHATIC HYDROPS

The development of a sensitive and specific diagnostic test for endoly mphatic hydrops has eluded investigators for over 30 years. The absenc e of such a test has hampered basic and clinical research into Meniere 's disease and related entities. Presently used tests are limited in t heir applicability because of their low sensitivity and specificity an d a poor understanding of the underlying physiologic principles. Despi te this, it is generally agreed that some of these studies have merit in selected situations. This article reviews the present state of diag nostic testing for endolymphatic hydrops. The use of nonspecific studi es, such as basic audiometry and tests for recruitment, and ''specific '' studies, such as electrocochleography and dehydration testing, are critically reviewed.