Eustachian Tube Function Test (ETF)
Eustachian Tube (ET) is a canal that connects the middle ear to the nasopharynx. ET performs gas transfer and pressure equalisation; clearance of mucus from the middle ear; and prevention of sound or fluid reflux from the nasopharynx. ETF is the test to identify opening and closing of Eustachian Tube.
- Blocking or Heaviness Sensation in Ear
- Fullness, Snapping or Popping sensation in Ear
- Fluctuating Hearing Loss
ETF can be performed whether the tympanic membrane is intact or perforated. ETF test is a series of three tympanograms on Resting middle ear pressure, Valsalva & Toynbee. ETF test is interpreted based on the shift between the peaks. Shift of 15 – 20 decapascals (daPa) between tympanograms suggests Normal Eustachian Tube Function.