ENT · Hearing Assessment (Audiometry, Tuning Fork Tests, ABR)

A 6-month-old infant fails newborn hearing screening. The appropriate NEXT confirmatory test is:

  • A Behavioral audiometry (visual reinforcement audiometry)
  • B Auditory Brainstem Response (ABR) testing under natural sleep
  • C Pure tone audiogram at 250-8000 Hz
  • D ASSR (Auditory Steady State Response) alone without ABR
Correct answer: B. Auditory Brainstem Response (ABR) testing under natural sleep

Explanation

ABR (click-evoked) is the gold-standard confirmatory test for newborn hearing screening failures in infants below 6 months (and up to 2 years), performed under natural sleep or sedation. It provides frequency-specific thresholds and is objective (no behavioral cooperation required). Behavioral audiometry (VRA) is appropriate from 6 months to 2.5 years. Pure tone audiometry requires cooperative responses (>3 years). ASSR alone is insufficient for diagnosis — ABR is always the confirmatory tool per JCIH guidelines.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

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