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Types of Hearing Loss

Conductive- Cochlear functions correctly, but something is blocking the sound from getting there

Mixed- Loss is part conductive, part sensorineural

Sensorineural- Cochlea is not functioning correctly


Aural Atresia or Congenital Aural Atresia- Missing ear canal

BMA- Bilateral Microtia and Atresia (i.e. both sides)

Canal Stenosis- Incomplete atresia, narrow ear canal

LMA- Left microtia and atresia (ie. unilateral on left side)

Microtia- Missing or deformed outer ear

RMA- Right microtia and atresia (ie. unilateral on right side)

Stapes Fixation / Malformation- Congenital malformation or fusion of the stapes (one of the three bones of the middle ear)

UMA- Unilateral microtia and atresia

Medical Tests

ABR- Auditory Brainstem Response (same as BAER)

Audiogram- Hearing Test

BAER- Brainstem Auditory Evoked Response (same as ABR)

CT Scan-Computerized Tomography Scan

HINT- Hearing In Noise Test

NBHS- Newborn Hearing Screening

MRI- Magnetic Resonance Imaging

Tympanogram- Test of pressure on ear drum

Audiogram Abbreviations

AC- Air Conduction

BC- Bone Conduction

CNT- Could Not Test

Cookie Bite- A loss that is exclusively (or worse) in the speech frequencies, the audiogram picture looks like a cookie with a bite taken out of it, hence the term,

dB -Decibel, measure of hearing (logorythmic)

DNT- Did Not Test

Hz- Herz, a measurement of the frequency of the sound being tested

KHz- Kilo Herz 4000 Hz == 4KHz

Mild Hearing Loss- 21-40 dB in children, 26-40 dB in adults

Moderate Hearing- loss 41-60 dB

Normal Hearing- anything under 20 dB in children, 25 dB in adults

Profound Hearing Loss- 81 dB or higher

PTA- Pure Tone Average, the average of the 3 speech frequencies where the person reliably responds to tones

Severe Hearing Loss- 61-80 dB

SLT- Speech Language Threshold

SNHL-Sensineural Hearing Loss

Speech Frequencies- 1K to 4K Hz

SRT- Speech Reception Threshold (SLT and SRT are pretty much interchangeable)

WNL-Within Normal Limits


BAHA- Bone Anchored Hearing Appliance

BCHA- Bone Conduction Hearing Aid

HA- Hearing Aid

FM System- Uses FM radio signal to send sound from person wearing microphone directly to hearing impaired individual

Sound Field System- Like FM, but uses “boom box” or amplifiers rather than headphones or hearing aids


Atresia Repair- Creation of an ear canal

Medpor Microtia Repair- Creation of an outer ear using a piece of high tech plastic

PORP- Partial Ossicular Replacement Prosthesis

Rib Graft Microtia Repair- Creation of an outer ear using a rib

Stapedotomy- Removal of stapes bone

TORP- Total Ossicular Replacement Prosthesis

Tympanostomy- ear “tubes” (sometimes called PE [Pressure Equalization] tubes)

VORP- Vibrating Ossicular Replacement Prosthesis


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