ABR/ASSR dBnHL → dBeHL Corrections

Enter uncorrected thresholds (dBnHL). The page applies age-based correction factors to generate estimated dBeHL. No data is stored.

Patient details

Date of birth

Used with test date to compute chronological age.

Gestational age at birth (weeks)

Prematurity weeks = max(0, 40 − GA).

Test date

Defaults to today.

Important: ASSR uses subtract (dBeHL = dBnHL − CF). ABR uses add (dBeHL = dBnHL + CF). Inserts assumed. (Supra-aural rows ignored.) ABR BC click ≤12w uses CF = 0 by design.

ASSR (NB CE-Chirp, Inserts)

Correction factors depend on the entered dBnHL band (0/5, 10/15, … 100).

Air conduction

Uncorrected threshold (dBnHL)

Corrected estimate (dBeHL)

Bone conduction

Uncorrected threshold (dBnHL)

Corrected estimate (dBeHL)

ABR (Inserts)

ABR correction factors depend on corrected age bracket and stimulus type. (ABR uses ADD.)

Air conduction — Tone pip / Click

Uncorrected threshold (dBnHL)

Corrected estimate (dBeHL)

Air conduction — Chirp

Uncorrected threshold (dBnHL)

Corrected estimate (dBeHL)

Bone conduction — Tone pip / Click

Uncorrected threshold (dBnHL)

Corrected estimate (dBeHL)

Bone conduction — Chirp

Uncorrected threshold (dBnHL)

Corrected estimate (dBeHL)

Acronyms & definitions (expanded)

ABR — Auditory Brainstem Response
ASSR — Auditory Steady-State Response
dBnHL — dB normal hearing level (system dial/reference scale)
dBeHL — dB estimated hearing level
GA — Gestational age
Corrected age — Chronological age minus prematurity (40 weeks − GA)
NB CE-Chirp — Narrow-band CE-chirp stimulus (ASSR)