<prompt> Following are the laboratory tests for the diagnosis of vestibular dysfunction except -ElectronystagmographyOptokinetic testGalvanic testGelles test  <response>: Ans. is d i.e., Gelles test Vestibular systemo The vestibular system contributes to balance and to the sense of spatial orientation,o It is a sensory system that provides the leading contribution about movement and sense of balance,o It includes the labyrinth semicircular canals and otolith : utricle sacules of the inner ear and is situated in the vestibulum in the inner ear.o The symptoms of vestibular dysfunction are vertigo, dizziness and imbalance,o There are several tests of vestibular functionClinical testsLaboratory testo Spontaneous nystagmuso Fistula testo Romberg testo Gaito Past- pointing and fallingo Hallpike manaeuver Positional testo Caloric testy Cold caloric test with ice cold water modified Kobraks testy Fitzgerald - Hallpike test Bithermal caloric testTemperature of water used is - 7degC from normal body temperature.y Cold-air caloric test by Dundas- Grant method. Done in case of perforation of tympanic membrane.o Electronystagmographyo Optokinetic testo Rotation testo Galvanic testo Posturography 