What is a bone conduction hearing test?

What is a bone conduction hearing test?

Bone Conduction Testing Audiologists use this type of testing when something, such as wax or fluid, is blocking your outer or middle ear. For this test, the audiologist will put a small device behind your ear or on your forehead. The sounds sent through this device cause your skull to gently vibrate.

How do you read bone conduction on an audiogram?

The air conduction results for the right ear are marked with a red “O,” and the results for the left ear are marked with a blue “X.” Bone conduction testing, in which a device is placed behind the ear in order to transmit sound through the vibration of the mastoid bone, is marked with a “[“ or a “<” symbol.

What frequencies are tested for bone conduction?

The testing procedure is repeated at specific frequencies from 250 to 8000 hertz (Hz, or cycles per second) for each ear, and the thresholds are recorded on a graph called an audiogram. Bone conduction testing is done by placing an oscillator on the mastoid process and measuring threshold at the same frequencies.

Why do we do bone conduction testing?

This test is important in helping to determine if there is a problem with the outer ear, such as the ear canal, or the middle ear, such as the eardrum or the bones of the middle ear.

Is bone conduction worse than air?

It is possible that bone-conduction thresholds can be worse than air-conduction thresholds by 20 dB on the basis of normal vari- ability. However, a statement to the effect that this difference is due to ex- pected intertest variability will be cor- rect only once out of every 5,000 times the statement is made.

Can a deaf person hear with bone conduction?

Bone conduction technology allows people with deafness to hear, helps tech-heads talk, and lets swimmers listen to music underwater. The Bonebridge implant transmits sound waves via bone conduction directly to the inner ear where they are processed just like a natural sound.

What is a normal hearing test score?


Degree of Hearing Loss Thresholds (dB)
Normal 0-25 Adult (0-15 infant)
Mild 20-40
Moderate 41-55

Which is better air or bone conduction?

Normal finding: Air conduction is better than bone conduction. The patient should be able to hear the sound of the tuning fork adjacent to their ear, persist for approximately twice as long as the sound they heard over their mastoid process. This is considered a “positive test.”

How is audiogram performed?

Pure tone testing (audiogram) — For this test, you wear earphones attached to the audiometer. Pure tones of a specific frequency and volume are delivered to one ear at a time. You are asked to signal when you hear a sound. A microphone monitors how well sound is conducted within the ear under different pressures.

What causes bone conduction hearing loss?

Common reasons for conductive hearing loss include blockage of your ear canal, a hole in your ear drum, problems with three small bones in your ear, or fluid in the space between your ear drum and cochlea. Fortunately, most cases of conductive hearing loss can be improved.

How can bone conduction remedy abnormalities?

A bone conduction hearing aid can improve hearing without implant surgery. When an obstruction occurs in the outer or middle ear — such as an infection, abnormal growth or tumor, or wax buildup — it can prevent sound from reaching your ear.

Do we normally hear better by bone or air conduction?

Normal individuals will hear the tone better by air conduction. In conductive hearing loss, bone conduction is greater than air conduction, because bone conduction bypasses problems in the external or middle ear. In sensorineural hearing loss, the tone is louder on the normal side.

How does audio bone conduction work?

Bone Conduction Technology: How Does It Work? Who invented bone conduction? Bone conduction was discovered by Ludwig van Beethoven, who was almost deaf, and he was a composer in the 18th century. How to listen through bone conduction? Bone conduction bypasses the eardrum. Bone conduction safer listening Bone conduction is a safer way of listening.

What is a bone conduction hearing system?

How bone conduction systems work. Bone anchored hearing systems are designed to use your body’s natural ability to transfer sound through bone conduction. The sound processor converts sounds into vibrations, which are then sent through your skull bone and directly on to your inner ear.

What does bone conduction stand for?

Air conduction refers to sound from the outside carried by air waves from the outer ear and transferred to electrical waves in the inner ear. Bone conduction refers to sound conducted as subtle vibration along the bones to the inner ear housing the organs of hearing and balance.

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