A positive fistula test during Siegelisation indicates-
Fistula test is done to Assess the Vestibular Function

Basis: In case of fistulous communication between middle ear and labyrinth

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Any pressure change in
External auditory canal (produced by pressing tragus or by siegel’s speculum)
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will stimulate lateral semicircular canal (Ans 11 – Ref Tuli 1/e p. 939)
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Produce nystagmus/vertigo
Ossicular discontinuity
Para-labyrinthitis due to erosion of lateral semicircular canal
CSF leak through the ear
Fixation of stapes bone