<prompt> Eustachian tube patency seen by ?ValsalvaMethylene blue testTonybee testAll the above  <response>: Ans. is d i.e., All the above Tests for Eustachian tube patency Valsalva test Methylene blue test Sonotubometry Politzer test Toynbee test Frenzel maneuver Catheterization Inflation - Deflation test 