What Is Bone Conduction Testing?

Article At A Glance

• Bone conduction testing bypasses the outer and middle ear entirely, sending vibrations directly to the cochlea to reveal exactly where your hearing loss originates.
• There are three distinct types of hearing loss — conductive, sensorineural, and mixed — and bone conduction testing is the key tool audiologists use to tell them apart.
• The test is completely painless and non-invasive, typically completed within minutes as part of a full audiological evaluation.
• Your results are plotted on an audiogram, and understanding how to read the gap between your air and bone conduction scores is critical to understanding your diagnosis.
• Certain symptoms should fast-track you to this test — keep reading to find out if you’re a candidate and what your results could mean for your treatment options.

If your audiologist suspects hearing loss, bone conduction testing is one of the most precise diagnostic tools they have — and understanding how it works puts you in a much stronger position when it comes to making decisions about your hearing health.

Sound Hearing, a leading provider of hearing health services, uses bone conduction testing as a core component of comprehensive hearing evaluations to help patients get accurate diagnoses and appropriate treatment faster.

Bone Conduction Testing Tells You Exactly Where Your Hearing Loss Comes From

Not all hearing loss is the same, and treating it without knowing its origin is like fixing a leak without finding the source. Bone conduction testing gives audiologists a precise picture of what’s happening inside your auditory system by separating the performance of your inner ear from the rest of the hearing pathway. That distinction changes everything about how your condition is managed.

When sound enters your ear normally, it travels through the outer ear canal, vibrates the eardrum, moves through the three tiny bones of the middle ear (the malleus, incus, and stapes), and then reaches the cochlea in the inner ear. A problem anywhere along that route causes hearing loss — but the location of the problem determines the type of hearing loss and the right treatment. Bone conduction testing isolates the inner ear by completely skipping the outer and middle ear, delivering sound vibrations directly through the bones of your skull to the cochlea. Learn more about when to worry about hearing loss to understand the implications of different types of hearing issues.

This is why it’s so diagnostically powerful. If your inner ear responds normally during a bone conduction test but you still struggle to hear through standard headphones, that tells your audiologist the problem is in your outer or middle ear — not your cochlea or auditory nerve. That single finding can redirect your entire treatment path.

What Bone Conduction Testing Actually Is

A bone conduction test is a type of pure-tone audiometry that measures how well your cochlea — the fluid-filled, spiral-shaped organ responsible for converting vibrations into sound signals — processes sound when the outer and middle ear are removed from the equation. Instead of delivering sound through the air and into your ear canal, the test uses a small electronic device called a bone oscillator to generate vibrations that travel directly through your skull to the cochlea. If you’re concerned about hearing loss, it’s important to know when to worry about hearing loss and seek professional advice.

The bone oscillator is typically placed on the mastoid bone, which is the hard, prominent bone located just behind your ear. When the oscillator is activated, it produces vibrations at specific frequencies and volumes, and you’re asked to respond each time you hear a tone. Your responses help the audiologist map out your hearing thresholds — the quietest sounds your inner ear can detect — across a range of frequencies from low to high pitch.

The Three Types of Hearing Loss Bone Conduction Testing Can Identify

Bone conduction testing is most valuable when its results are compared directly against air conduction test results. That comparison allows audiologists to classify hearing loss into one of three categories, each with very different treatment implications.

• Conductive Hearing Loss: Bone conduction thresholds are normal, but air conduction thresholds are elevated. This means the inner ear is functioning well, but something in the outer or middle ear is blocking sound from getting through — such as earwax buildup, fluid from an ear infection, a perforated eardrum, or abnormal bone growth (otosclerosis).
• Sensorineural Hearing Loss: Both bone and air conduction thresholds are equally elevated. The inner ear or auditory nerve is damaged, and sound isn’t being processed correctly regardless of how it’s delivered. This is the most common type of permanent hearing loss and is often associated with aging or noise exposure.
• Mixed Hearing Loss: Both bone and air conduction thresholds are elevated, but the air conduction thresholds are worse than the bone conduction thresholds. This indicates a combination of conductive and sensorineural components occurring simultaneously.

Understanding which type you have is not just academic — it directly determines whether your treatment path involves medication, surgery, hearing aids, or a combination of approaches. A person with conductive hearing loss from fluid in the ear may fully recover with medical treatment, while someone with sensorineural loss will likely need long-term hearing amplification strategies.

Bone Conduction vs. Air Conduction Tests

These two tests are always used together, not interchangeably. Air conduction testing evaluates the entire hearing pathway — from the outer ear canal all the way through to the auditory nerve — by delivering tones through insert earphones or over-the-ear headphones. Bone conduction testing evaluates only the inner ear by bypassing everything upstream. The difference between your scores on each test, known as the air-bone gap, is the most important diagnostic measurement in audiometry. If you are concerned about your hearing health, learn more about when to worry about hearing loss.

Feature	Air Conduction Test	Bone Conduction Test
What it evaluates	Full hearing pathway	Inner ear only
Equipment used	Headphones or insert earphones	Bone oscillator on mastoid bone
Bypasses outer/middle ear?	No	Yes
Key diagnostic use	Detect presence and degree of hearing loss	Identify location and type of hearing loss

What Happens During a Bone Conduction Test

The bone conduction test is performed immediately after the air conduction test as part of a standard audiological evaluation. The entire process is straightforward, painless, and typically takes only a few minutes to complete.

Your audiologist will begin by placing a bone oscillator — a small, flat device attached to a headband — against your mastoid bone behind one ear. A masking noise is often played into the opposite ear through a headphone at the same time. This prevents the non-test ear from picking up the vibrations and skewing the results, a technique called masking that’s critical for getting accurate, ear-specific data.

Once the equipment is in position, your audiologist will present a series of pure tones at varying frequencies — typically ranging from 250 Hz (low pitch) to 4,000 Hz (high pitch) — through the bone oscillator. Each tone is presented at different volume levels, and you’ll signal (usually by pressing a button or raising your hand) each time you hear a sound, even if it’s very faint. The audiologist records your lowest detectable threshold at each frequency.

• The test is completely non-invasive — nothing enters the ear canal
• You’ll be seated in a sound-treated booth to eliminate background noise interference
• The bone oscillator applies only slight pressure against the skin — there is no discomfort
• Results are recorded in real time on an audiogram using specific symbols to distinguish bone conduction from air conduction scores
• The full evaluation, including both air and bone conduction testing, typically takes 30 to 60 minutes

How to Read Your Bone Conduction Test Results

Your bone conduction test results are plotted on an audiogram — a graph that maps your hearing thresholds across different frequencies. The horizontal axis represents frequency (pitch) measured in Hertz (Hz), running from low frequencies on the left to high frequencies on the right. The vertical axis represents volume (intensity) measured in decibels (dB), with quieter sounds at the top and louder sounds toward the bottom. The further down your thresholds fall on the audiogram, the greater your degree of hearing loss.

On a standard audiogram, bone conduction results are marked with specific symbols to distinguish them from air conduction results. Bone conduction thresholds for the right ear are typically marked with a < symbol, while the left ear uses a > symbol. Air conduction results use circles (right ear) and X marks (left ear). When your audiologist reviews these together, the relationship between the two sets of symbols tells the complete diagnostic story.

The most critical measurement to understand is the air-bone gap. A gap of 10 dB or more between your air conduction threshold and your bone conduction threshold at the same frequency is considered clinically significant and points toward a conductive component to your hearing loss. When both thresholds are elevated equally — meaning no gap exists — sensorineural hearing loss is indicated. A mixed pattern shows both an elevated bone conduction threshold and an even larger air-bone gap on top of it.

• Normal hearing: Bone conduction thresholds fall between 0 and 25 dB across all tested frequencies
• Mild hearing loss: Thresholds between 26 and 40 dB — soft speech and quiet environments become difficult
• Moderate hearing loss: Thresholds between 41 and 55 dB — conversational speech at normal volumes is affected
• Moderately severe: Thresholds between 56 and 70 dB — most conversational speech is difficult to follow without amplification
• Severe hearing loss: Thresholds between 71 and 90 dB — only loud sounds are detected without hearing aids
• Profound hearing loss: Thresholds above 91 dB — very limited hearing even with amplification; cochlear implant candidacy may be evaluated

Understanding where your bone conduction thresholds fall within these categories helps you and your audiologist set realistic expectations and prioritize the right interventions. Even a mild air-bone gap is worth investigating, because conductive causes of hearing loss are frequently treatable — and in some cases, fully reversible.

Who Should Get a Bone Conduction Test

Bone conduction testing is recommended for anyone who has failed a hearing screening, reported sudden or gradual hearing changes, or presents with symptoms that suggest something more than age-related hearing decline. It is also a standard component of any comprehensive audiological evaluation for children, since conductive hearing loss from recurrent ear infections or fluid buildup is extremely common in pediatric patients and can significantly impact speech and language development if left undetected.

Adults experiencing a noticeable difference in hearing between one ear and the other, a sense of fullness or pressure in the ear, dizziness, tinnitus, or a history of ear infections, head trauma, or ear surgery are all strong candidates for bone conduction testing. The test is equally important for patients who are considering hearing aids, cochlear implants, or bone-anchored hearing systems — because the type and degree of hearing loss determined by bone conduction results directly influences which technology will be most effective.

Your Bone Conduction Results Are the Starting Point, Not the End

A bone conduction test result is a diagnostic tool, not a final verdict. Whether your results point toward a conductive, sensorineural, or mixed hearing loss, the next step is always a conversation with your audiologist about what the findings mean for your specific situation and what your treatment options look like. For many patients, particularly those with conductive loss, the path forward includes medical referral and the real possibility of significant improvement — sometimes even full restoration of hearing.

For those with sensorineural loss, modern hearing technology has advanced to a point where the vast majority of people can achieve meaningful, life-changing improvements in their hearing ability. Sound Hearing provides comprehensive audiological care and can help guide you through every step of the process, from initial testing through to long-term hearing management.

Frequently Asked Questions

Bone conduction testing often raises practical questions for patients who are preparing for their first evaluation or trying to interpret their results. For those wondering about the connection between hearing loss and balance, the answers below address the most common points of confusion and concern.

Is a Bone Conduction Test Painful?

No. A bone conduction test is completely painless. The bone oscillator rests gently against the mastoid bone behind your ear and is held in place by a light headband. You may feel a mild vibration during the test, particularly at lower frequencies, but there is no discomfort, no pressure inside the ear canal, and no invasive components whatsoever. Patients of all ages, including young children, tolerate the procedure without difficulty.

How Long Does a Bone Conduction Test Take?

The bone conduction portion of a hearing evaluation typically takes between 10 and 20 minutes on its own. However, it is almost always performed as part of a broader audiological assessment that includes air conduction testing, speech recognition testing, and sometimes tympanometry. The full appointment generally runs between 30 and 60 minutes from start to finish, including time for your audiologist to review and explain the results with you.

Can Children Undergo Bone Conduction Testing?

Yes, and in many cases it is especially important for children. Bone conduction testing can be adapted for pediatric patients using play audiometry techniques, where children are conditioned to respond to sounds through a game-like activity rather than a button press. This makes accurate threshold measurement possible even in very young children. Detecting conductive hearing loss early in childhood is critical, as untreated hearing loss during formative years can delay speech development, affect academic performance, and impact social development.

Does a Bone Conduction Test Require a Referral?

In most cases, you can schedule a hearing evaluation — including bone conduction testing — directly with an audiologist without a physician referral. However, if your test results indicate a medical cause of hearing loss, such as fluid in the middle ear, abnormal bone growth, or a suspected tumor on the auditory nerve, your audiologist will refer you to an ear, nose, and throat (ENT) specialist, also known as an otolaryngologist, for further evaluation and medical management.

What Is a Normal Result on a Bone Conduction Test?

A normal bone conduction result means your hearing thresholds fall between 0 and 25 dB across the tested frequencies, indicating that your cochlea and auditory nerve are processing sound effectively. Normal bone conduction results paired with elevated air conduction thresholds confirm conductive hearing loss. Normal results across both tests confirm no significant hearing loss is present at the time of testing.

Can Bone Conduction Testing Detect Tinnitus?

Bone conduction testing does not directly detect tinnitus — the perception of ringing, buzzing, or other phantom sounds in the ears. However, the results of a bone conduction test frequently help explain why tinnitus is occurring by identifying the underlying hearing loss pattern associated with it. Tinnitus is commonly linked to sensorineural hearing loss, and audiograms showing elevated bone conduction thresholds in the high-frequency range often correlate with the pitch and character of a patient’s tinnitus experience.

What Happens After an Abnormal Bone Conduction Test Result?

An abnormal bone conduction result — meaning your inner ear thresholds are elevated — indicates sensorineural hearing loss and typically leads to further audiological assessment and a discussion of hearing amplification options. If only your air conduction results are abnormal and your bone conduction thresholds are normal, your audiologist will likely refer you for medical evaluation to investigate and treat the conductive cause. In either scenario, the result is the beginning of a clear and targeted management plan, not a dead end. Sound Hearing’s team of audiologists is equipped to walk you through your results, answer your questions, and connect you with the right next steps for your hearing health journey.

Can Children Undergo Bone Conduction Testing?

Yes, and in many cases it is especially important for children. Bone conduction testing can be adapted for pediatric patients using play audiometry techniques, where children are conditioned to respond to sounds through a game-like activity rather than a button press. This makes accurate threshold measurement possible even in very young children.

Detecting conductive hearing loss early in childhood is critical. Untreated hearing loss during formative years can delay speech development, affect academic performance, and impact social skills in ways that compound over time. The earlier a problem is identified, the more treatment options are available and the better the long-term outcome for the child.

Does a Bone Conduction Test Require a Referral?

In most cases, you can schedule a hearing evaluation — including bone conduction testing — directly with an audiologist without a physician referral. However, if your test results indicate a medical cause of hearing loss, such as fluid in the middle ear, abnormal bone growth, or a suspected tumor on the auditory nerve, your audiologist will refer you to an ear, nose, and throat (ENT) specialist, also known as an otolaryngologist, for further evaluation and medical management.

What Is a Normal Result on a Bone Conduction Test?

A normal bone conduction result means your hearing thresholds fall between 0 and 25 dB across all tested frequencies. This indicates that your cochlea and auditory nerve are processing sound effectively, regardless of what is happening in the outer or middle ear.

Normal bone conduction results paired with elevated air conduction thresholds confirm conductive hearing loss — meaning the inner ear is intact but something upstream is interfering with sound transmission. When both results are normal, no significant hearing loss is present at the time of testing, though follow-up evaluations may still be recommended if symptoms persist.

Can Bone Conduction Testing Detect Tinnitus?

Bone conduction testing does not directly detect tinnitus — the perception of ringing, buzzing, hissing, or other phantom sounds in the ears. Tinnitus is a symptom, not a condition that shows up on an audiogram. What the test can do is identify the underlying hearing loss pattern that is frequently associated with tinnitus, which is an important step toward managing it effectively.

Tinnitus is commonly linked to sensorineural hearing loss, and audiograms showing elevated bone conduction thresholds in the high-frequency range — particularly around 4,000 Hz — often correlate with the pitch and character of a patient’s tinnitus experience. That information helps clinicians develop a targeted management plan, which may include sound therapy, hearing aids, or cognitive behavioral approaches.

What Happens After an Abnormal Bone Conduction Test Result?

An abnormal bone conduction result — meaning your inner ear thresholds are elevated — indicates sensorineural hearing loss. This typically leads to a detailed discussion about the degree of loss, the frequencies most affected, and the hearing amplification or rehabilitation options best suited to your lifestyle and communication needs.

If only your air conduction results are abnormal and your bone conduction thresholds are normal, your audiologist will likely refer you to a medical specialist to investigate and treat the conductive cause. Many conductive conditions — including otosclerosis, chronic ear infections, and middle ear fluid — are medically or surgically treatable, and resolving the underlying cause can significantly restore hearing without the need for hearing aids. For more information on symptoms that require immediate attention, you can read about hearing loss symptoms that need urgent care.

Bone conduction testing is a vital component in diagnosing hearing loss. It helps determine how well sound travels through the bones of the skull to the inner ear. This type of testing is particularly useful in identifying the type of hearing loss a person may have, whether it’s conductive, sensorineural, or mixed. Understanding the signs of hearing loss can aid in early diagnosis and treatment, potentially improving quality of life.