Hearing Screening Procedures
PURE TONE THRESHOLD SCREENING
Ages/Grades: 3 years through school age (as indicated).
Purpose: To obtain a record of the child's level of hearing prior to initial referral.
Description: Have the child listen to a series of pure tones and record the softest dB level that the child responds to at each frequency. Use only “time locked” not “random” responses
Equipment: Pure tone audiometer.
Facilities: Quiet room, free from visual distractions.
- Seat the children so they cannot see the front of the audiometer.
- Remove glasses, hair bands, large earrings, etc.
- Place hair behind the ears.
- Instruct the child to raise either hand when a tone is heard.
- Set selector switch to Right.
- Set HL dial to 40 dB.
- Set frequency dial to 1000 Hz.
- Place the earphones on child's head with the red phone on the right ear and the headband flush to the head.
- Screen right or better ear.
- Present the 1000 Hz tone at 40, 20, 0 dB until there is no response.
- At the level there is no response, increase in 5 dB increments until there is response.
- Drop 10 dB.
- Increase in 5 dB increments until there is a response.
- Repeat until there are 2 responses at the same level.
- Record threshold level.
- Repeat the process for 2000, 4000, 8000, recheck 1000 Hz and 500 Hz in the right or better ear.
- Repeat for the other ear.
WNL: Child's threshold is above the bold line on the audiogram (20dB at 500 Hz, 15dB at 1000, 2000, 4000 Hz).
Referral: Any threshold level on or below the bold line on the audiogram (25dB at 500 Hz, 20dB at 1000, 2000, 4000 Hz).
Exceptions: When a child has a known hearing loss that has been diagnosed as non-treatable, referral to the school audiologist should be made if there is a change of 10dB poorer at any frequency.
NOTE: For children who are difficult to screen, use play audiometry procedures