This test, along with egophony and whispered pectoriloquy, is used to assess for consolidation in the lung.

Performing the Test

  1. Ask the patient to repeat "ninety-nine" out loud and at moderate volume
  2. Listen to the posterior lung fields with the the diaphragm of the stethoscope, noting any asymmetry

In normal lungs, the transmitted "ninety-nine" will be muffled and indistinct. Abnormally loud and clear voice sounds indicates presence of bronchophony and may indicate consolidation.


  1. Bickley LS. The thorax and lungs. In: Bickley LS, Szilagyi PG. Bates' Guide to Physical Examination and History Taking. 10th ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2009:283-321.