What Is Tympanometry?

What does tympanometry measure?

The middle ear is the air-filled space behind the eardrum. It contains three small bones that help transfer sound toward the inner ear. For that system to work efficiently, the eardrum and middle-ear structures must move appropriately, and pressure on both sides of the eardrum should be reasonably balanced.

During tympanometry, the instrument changes pressure in the sealed ear canal while measuring the eardrum and middle ear's acoustic response. The test provides information about **middle-ear function**, including:

How mobile or stiff the eardrum and middle-ear system appear

The pressure at which the system moves most efficiently

An estimate of the volume of the ear canal

The overall shape and width of the tympanogram

These measurements can help a clinician recognize patterns associated with fluid behind the eardrum, negative middle-ear pressure, a hole in the eardrum, an open pressure-equalization tube, or unusual stiffness or mobility. However, the same pattern may have more than one possible explanation. Interpretation requires context.

What happens during a tympanometry test?

The clinician will usually begin by asking about your symptoms and looking into each ear with an otoscope. This visual examination can identify earwax, drainage, a visible eardrum problem, or another issue that may affect testing.

For tympanometry, the clinician places a small, soft probe tip at the opening of the ear canal. The probe contains components that present a tone, change air pressure, and measure the returning sound energy. You may feel pressure similar to the sensation of changing altitude, and you may hear a low tone or hum.

The pressure sweep normally lasts only a few seconds for each ear. You do not need to respond to the tone. It is helpful to remain still and avoid talking, swallowing, chewing, or moving your jaw while the measurement is underway because movement can interfere with the seal or the recording.

If the instrument cannot obtain a reliable result, the clinician may reposition the probe, select a different tip size, clear an equipment issue, or repeat the test.

Does tympanometry hurt?

Tympanometry is generally quick and noninvasive. Most people describe temporary pressure or fullness rather than pain. Young children may dislike the unfamiliar sensation or the need to stay still, but the measurement itself is brief.

Tell the clinician before testing if you have severe ear pain, active drainage, recent ear surgery, a known eardrum perforation, or pressure-equalization tubes. The clinician can decide whether and how the test should be performed. If the procedure becomes painful, say so immediately.

How long does the test take?

The actual pressure measurement usually takes only seconds per ear. Preparation, otoscopy, achieving a proper seal, repeating an unclear measurement, and completing other tests can make the appointment longer. Tympanometry is often one part of a broader hearing evaluation rather than a stand-alone visit.

Understanding the measurements

A tympanometer may report several values. Reference ranges vary by age, probe tone, equipment, and clinical protocol, so a printed number should not be interpreted without a qualified clinician.

Ear-canal volume

The estimated ear-canal volume helps the clinician interpret the rest of the graph. On a flat tympanogram, for example, a volume that appears typical may support a different explanation than a very large or very small volume.

A very large measured volume with a flat graph may be consistent with an open pressure-equalization tube or an eardrum perforation because the instrument may be measuring beyond the ear canal into the middle-ear space. A very small volume can occur when the probe is blocked by the canal wall, debris, or earwax, or when the seal or placement is not adequate. These are possibilities, not diagnoses.

Peak pressure

Peak pressure is the ear-canal pressure at which the middle-ear system shows its greatest measured mobility. A peak shifted toward negative pressure can be associated with poor pressure equalization through the eustachian tube. Symptoms, otoscopy, the degree of the shift, and other findings determine whether that result is clinically meaningful.

Admittance or compliance

This value describes how readily acoustic energy moves through the eardrum and middle-ear system under the test conditions. Lower mobility can suggest a stiffer system; unusually high mobility can suggest a more flexible or discontinuous system. Neither finding identifies a cause by itself.

Tympanometric width or gradient

The width or gradient describes aspects of the tympanogram's shape around its peak. Clinicians may use it with the other measurements when evaluating the likelihood of middle-ear dysfunction. The way it is calculated and interpreted can vary by instrument and protocol.

What do Type A, As, Ad, B, and C tympanograms mean?

Clinicians commonly describe tympanograms by their overall shape. These labels are useful shorthand, but they are not complete diagnoses and are not interpreted identically in every setting.

| Tympanogram pattern | General description | What it may suggest |
|---|---|---|
| **Type A** | A peak occurs within the expected pressure and mobility region | A generally typical middle-ear pattern at the time of testing |
| **Type As** | A peak is present but shallow | A relatively stiff eardrum or middle-ear system |
| **Type Ad** | A very tall or highly mobile peak | An unusually mobile eardrum or, in some cases, altered movement of the middle-ear bones |
| **Type B** | A flat or nearly flat tracing without a clear peak | Fluid, an open tube, an eardrum perforation, probe obstruction, or another factor; ear-canal volume is especially important |
| **Type C** | The peak occurs at notably negative pressure | Negative middle-ear pressure that may be associated with eustachian-tube dysfunction |

A Type A result does not prove that hearing is normal. A person can have typical middle-ear function and still have inner-ear or neural hearing loss. Likewise, Type B or Type C is not a final diagnosis of an ear infection. Your clinician must connect the pattern to the full evaluation.

What can cause a flat Type B tympanogram?

A flat tympanogram receives attention because it does not show a distinct mobility peak, but the graph's shape alone is not enough to explain why. The estimated ear-canal volume and ear examination help narrow the possibilities.

Possible explanations include:

Fluid in the middle ear

A perforated eardrum

A functioning pressure-equalization tube

Earwax or debris blocking the probe

The probe tip pressing against the canal wall

An inadequate seal or another technical problem

This is why it is risky to interpret “Type B” as automatically meaning fluid or infection. The complete result matters.

What can tympanometry help detect?

Tympanometry may contribute useful evidence when a clinician is evaluating:

A feeling of pressure, blockage, or fullness in an ear

Suspected fluid behind the eardrum

Possible eustachian-tube dysfunction

Recurrent or persistent middle-ear problems

Conductive hearing loss found on an audiogram

A possible eardrum perforation

Whether a pressure-equalization tube appears open

Unusual stiffness or excessive mobility in the middle-ear system

Hearing concerns in someone who cannot reliably complete behavioral testing

The test may also be used before or after certain medical treatments, as part of pediatric hearing screening or diagnostic assessment, or alongside acoustic reflex testing.

What can tympanometry not tell you?

Tympanometry does **not** directly measure the quietest sounds you can hear. It cannot determine your full hearing sensitivity, speech understanding, or how well you hear in noise. It also cannot, by itself:

Confirm that hearing is normal

Measure the severity of sensorineural hearing loss

Diagnose an ear infection without other clinical findings

Identify every eardrum or middle-ear disorder

Explain tinnitus, dizziness, or ear pain on its own

Replace otoscopy, audiometry, or a medical examination when indicated

A normal tympanogram is reassuring about the measured middle-ear response, but it does not rule out inner-ear hearing loss, auditory-processing problems, or other conditions.

Tympanometry vs. a hearing test

People sometimes call tympanometry a hearing test, but the two procedures answer different questions.

| Test | Main question | Does the patient respond? |
|---|---|---|
| **Tympanometry** | How is the eardrum and middle-ear system functioning under changing pressure? | Usually no behavioral response is required |
| **Pure-tone audiometry** | What are the softest tones a person can detect at different frequencies? | Yes |
| **Speech audiometry** | How softly can speech be detected, and how clearly can words be recognized under test conditions? | Yes |

Together, these results help localize a problem. For example, reduced air-conduction hearing with typical bone-conduction thresholds and an abnormal tympanogram may support a conductive component. An audiologist interprets the pattern across tests rather than relying on one result.

Tympanometry vs. otoscopy

**Otoscopy** is visual inspection of the ear canal and eardrum. It can reveal wax, redness, drainage, a tube, a visible perforation, or structural changes. **Tympanometry** measures the acoustic and mechanical response of the system as pressure changes.

The tests complement each other. Otoscopy can explain why a measurement is unusual or why testing should be postponed, while tympanometry supplies information that cannot be obtained by looking alone.

Tympanometry vs. pneumatic otoscopy

During pneumatic otoscopy, a clinician looks at the eardrum while gently changing pressure in the ear canal to assess movement. Tympanometry uses an instrument to create a pressure sweep and record a graph and numerical measurements. Both can contribute information about eardrum mobility, but they are performed and interpreted differently.

Is acoustic reflex testing the same thing?

No. Tympanometry and acoustic reflex testing are different measurements, although they are often performed with the same equipment during one appointment.

Tympanometry evaluates the middle-ear system across changing pressure. Acoustic reflex testing assesses a measurable response involving muscles in the middle ear when sound is presented. Reflex results can add information about parts of the auditory pathway, but they must be interpreted in the context of the audiogram, tympanogram, symptoms, and other findings.

Tympanometry in babies and children

Tympanometry can be especially helpful for children because middle-ear fluid and pressure problems can affect hearing, speech access, and test results. The child does not need to raise a hand or press a button, but a reliable seal and a few seconds of stillness are still necessary. Crying, talking, or movement can make the recording difficult.

The middle ears of young infants behave differently from those of older children and adults. Clinicians may use a higher-frequency probe tone or age-specific methods and interpretation. A result obtained with an adult protocol should not automatically be interpreted the same way in a young infant.

Tympanometry alone does not tell parents how much a child can hear. Depending on age and concern, the broader assessment may include otoacoustic emissions, auditory brainstem response testing, behavioral audiometry, or speech testing.

Tympanometry with ear tubes

If a child or adult has pressure-equalization tubes, tympanometry can sometimes help assess whether a tube appears open. A flat tracing with a relatively large ear-canal volume may be consistent with an open tube because the measured space includes the ear canal and middle ear.

That pattern is not conclusive without confirming the person's history and examining the ear. Wax, tube position, a blocked tube, an eardrum perforation, and technical factors can change the result.

Why might a result be unclear or inaccurate?

Tympanometry depends on a proper probe seal and a clean measurement. Results can be affected by:

Talking, swallowing, crying, or jaw movement

A probe tip that does not seal the canal

The probe resting against the canal wall

Earwax or debris obstructing the probe

Equipment or calibration issues

Anatomy that makes placement difficult

Using a measurement approach that is not appropriate for the patient's age

Repeating the test is common and does not necessarily mean something is wrong with the ear.

How should you prepare?

Most people do not need special preparation. Before the visit:

Bring information about ear symptoms, recent infections, surgeries, tubes, and medications.

Tell the clinician about pain, drainage, a known perforation, or recent ear surgery.

Avoid putting objects into the ear or trying to remove deep wax yourself.

For a young child, explain that a soft tip will touch the ear and that staying still for a few seconds helps the test finish quickly.

You generally do not need to fast, stop routine medication, or avoid normal activity unless your clinician gives you different instructions.

What happens after an abnormal tympanogram?

The next step depends on the entire evaluation—not simply the letter assigned to the graph. The clinician may:

Repeat tympanometry to confirm the result

Review otoscopy findings

Complete pure-tone and speech testing

Compare air- and bone-conduction thresholds

Perform acoustic reflexes or other middle-ear measures

Recommend monitoring and retesting

Refer you to a physician or ear, nose, and throat specialist

Discuss treatment if a medical diagnosis has already been established

Some pressure changes resolve, while persistent or symptomatic findings may need medical follow-up. Ask what the pattern means in your specific case and when it should be rechecked.

When should you seek prompt care?

Contact a healthcare professional promptly for significant ear pain, drainage, bleeding, fever with ear symptoms, marked dizziness, facial weakness, or symptoms after injury. Sudden hearing loss in one or both ears requires urgent assessment, even if the ear feels blocked or you suspect wax or congestion. Tympanometry may be part of the evaluation, but it should not delay medical care.

Questions to ask about your results

Was the recording reliable in both ears?

What were the ear-canal volume, peak pressure, and mobility findings?

Does the pattern match what you saw during otoscopy?

Is there evidence of a conductive component?

Do I need a complete hearing evaluation or medical examination?

Should the test be repeated, and if so, when?

Are my results different from an earlier test?

Which symptoms should prompt faster follow-up?

The bottom line

Tympanometry is a brief, objective measurement of how the eardrum and middle-ear system respond to changing air pressure. It can help identify patterns consistent with fluid, pressure imbalance, an open ear tube, a perforation, or altered middle-ear mobility. It does not measure hearing thresholds and does not provide a diagnosis by itself.

The most useful interpretation combines the tympanogram with your symptoms, ear examination, audiogram, and other test results. If you have ongoing fullness, pain, hearing difficulty, or an abnormal result, ask an audiologist or medical professional what the complete pattern means for you.