Audiology Abbreviations -- list; glossary

ABR Auditory Brainstem Response
AC Air Conduction
AGC Automatic Gain Control
AGCo Automatic Gain Control for output
AI Articulation Index
ALD Assistive Listening Device
APHAB Abbreviated Profile for Hearing Aid Benefit
ANSI American National Standards Institute
AOV Acoustically Optimized Venting (Phonak)
ASP Automatic Signal Processor
AVC Automatic Volume Control
BBN Broadband Noise
BC Bone Conduction
BiCROS Bilateral CROS (see CROS)
BTE Behind The Ear hearing instrument
CFA Continuous Flow Adapter (earmold)
CI Cochlear Implant
CL Comfortable Level
CNS Central Nervous System
CNT Can Not Test
CORFIG Coupler Response for Flat Insertion Gain
… (dB offsets for coupler → simulated real ear; f(REUG, MLE, RECD)
COSI Client Oriented Scale of Improvement (NAL questionnaire)
CPS Cycles Per Second
CROS Contralateral Routing of Signals
dB deciBel
dBA decibels on a scale of a sound level meter
DNR Did Not Respond
DNT Did Not Test
DR Dynamic Range
DS Discrimination Score
DSL Desired Sensation Level
EIN Equivalent Input Noise
ENT Ear, Nose, and Throat specialist
EM Effective Masking
FF Free Field
FOG Full On Gain
HA Hearing Aid
HAE Hearing Aid Evaluation
HD Harmonic Distortion
HFA High Frequency Average
HL Hearing Level
HTL Hearing Threshold Level
Hz Hertz
IA Interaural Attenuation
ID Inside Diameter (usually tubing)
ISTS International Speech Test Signal
ITC In-the-canal
ITE In–the–ear hearing instrument
IL Intensity Level
IM Intermodulation Distortion
IHS International Hearing Society
JND Just Noticeable Difference
KEMAR Knowles Electronic Manikin for Acoustical Research
… (dummy head/torso/ears with median human dimensions)
kHz KiloHertz
LDL Loudness Discomfort Level (see UCL)
LL Loudness Level
LTASS Longi-Term Average Speech Spectrum
MCT Minimum Contact Technology
MCL Most Comfortable Level|Loudness
MLE Microphone Location Effect
MPO Maximum Power Output
MSP Multiple Signal Processor
NAEL National Association of Earmold Laboratories
NAL National Acoustic Laboratories (of Australia)
NBN Narrowband Noise
NL1/NL2 Non-Linear
NR No Response
OD Outside Diameter (usually tubing)
PB Phonetically Balanced
PRN Phoneme Recognition in Noise
PTA Pure Tone Average
PTS Permanent Threshold Shift
REAG Real Ear Aided Gain
REAR Real Ear Aided Response
RECD Real Ear To Coupler Difference
REIG Real Ear Insertion Gain (= REAR - REUR; = REAG - REUG)
REIR Real Ear Insertion Response
REM Real Ear Measures
REOG Real Ear Occluded Gain
REOR Real Ear Occluded Response
RETSPL Reference Equivalent Threshold Sound Pressure Level
… (calibrated SPL produced by audiometer)
REUG Real Ear Unaided Gain
REUR Real Ear Unaided Response
RIC Receiver In Canal
RITE Receiver In The Ear
RMS Root Mean Square (a composite tone)
RTG Reference Test Gain
RTP Reference Test Position
SAT Speech Awareness Threshold
SAV Select–A–Vent
SDS Speech Discrimination Score
SDT Speech Detection Threshold
SF Sound Field
SII Speech Intelligibility Index (ANSI standardized AI)
SIL Speech Interference Level
SISI Short Increment Sensitivity Index
SL Sensation Level
SLM Sound Level Meter
S/N Signal to Noise
SPL Sound Pressure Level
SRT Speech Reception Threshold
SSPL Saturation Sound Pressure Level
TD Threshold of Discomfort
THD Total Harmonic Distortion
TK Threshold Kneepoint
TL Tolerance Level
TM Tympanic Membrane
TMJ Temporomandibular Joint
TTS Temporary Threshold Shift
UCL Uncomfortable Loudness (see LDL)
VU Volume Unit (e.g., VU Meter on Audiometer)


Thank you, I have been waiting for a list like this.

1 Like


This is extremely helpful for a noob like me.

Thank-you, Brec!

Jim G

Thank you… I do not understand most of the terms but still this is a very helpful list for newbies like me.