Audiogram Report: Reading the Hearing Test Graph and dB Loss
Short answer: an audiogram is a graph of the quietest sounds you can hear at each pitch. The O marks are your right ear and the X marks your left. The lower the marks sit on the chart, the louder a sound had to be before you heard it. Marks around 0 to 20 or 25 dB are usually read as normal hearing; lower down means mild, moderate, severe or profound loss.
In brief
- Across the top: pitch, in hertz (Hz), low on the left and high on the right.
- Down the side: loudness, in decibels (dB), quiet at the top and loud at the bottom.
- O = right ear, X = left ear (air conduction). Brackets or arrows are bone conduction.
- Gap between air and bone marks: points to a conductive problem in the outer or middle ear.
- Emergency: sudden hearing loss in one ear needs a doctor the same day.
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The audiologist hands you a sheet with a grid, red circles and blue crosses joined by lines that slope downwards like a hill. Your uncle’s looked the same. The words underneath say “bilateral mild to moderate sensorineural hearing loss, sloping configuration.” Sounds serious and technical at the same time. Here’s how to read it yourself before you sit down with the doctor.
What does a hearing test graph show?
During pure-tone audiometry you sit in a quiet booth with headphones. Beeps play at different pitches, getting softer until you can barely catch them, and you press a button or raise a hand every time you hear one. The softest level you hear about half the time is your threshold for that pitch. Each threshold becomes a mark on the graph.
ELI5: the chart is upside down from what you expect. Top of the chart means you heard a whisper-quiet beep. Bottom means the beep had to be shouting-loud. So good hearing sits near the top, and a line sliding downhill means you’re missing more and more.
The symbols and axes, explained
| Symbol or label | Meaning |
|---|---|
| O (often red) | Right ear, air conduction: sound through headphones |
| X (often blue) | Left ear, air conduction |
| < or [ and > or ] | Bone conduction: sound sent through a small vibrator behind the ear, skipping the outer and middle ear |
| Triangle or square | “Masked” result: noise played in the other ear so it can’t help |
| Arrow pointing down | No response even at the machine’s loudest level |
| 250 to 8000 Hz | Pitch range tested; speech sits mostly in the middle |
What the dB levels mean
These are the common bands, though clinics use slightly different cut-offs; go by what your report says:
- Normal: up to about 20 to 25 dB. You hear soft speech easily.
- Mild loss: about 26 to 40 dB. Soft voices and speech in a noisy dhaba get hard.
- Moderate: about 41 to 70 dB. Normal conversation is a struggle without help.
- Severe: about 71 to 90 dB. Only loud speech gets through.
- Profound: above about 90 dB. Even shouting may not be heard.
The report often gives a pure-tone average (PTA), the mean of the thresholds at 500, 1000 and 2000 Hz (sometimes 4000 too). It’s a single number that sums up how you hear speech.
On an audiogram, higher is better. A line sliding down the chart is a sound sliding out of reach.
Conductive vs sensorineural hearing loss
Conductive loss means sound is blocked on the way in: wax, fluid behind the eardrum, a hole in the drum, or stiff little middle-ear bones. On the graph, the bone marks sit near normal while the O or X marks sit lower. That space between them is the “air-bone gap”, and it’s the signature of conductive loss. Many conductive problems can be fixed by a doctor.
Sensorineural loss means the inner ear (the cochlea) or hearing nerve is damaged. Both air and bone marks drop together, with no gap. Age, years of loud noise, some medicines, diabetes and genes are common causes. It’s usually permanent, and hearing aids help most people.
Mixed loss has both: a gap, and bone marks that are also lower than normal.
Patterns worth knowing
A sloping line, fine at low pitches and dropping at high pitches, is the typical age-related shape. People with it say “I can hear you, I just can’t understand you,” because consonants like s, f and th are high-pitched.
A notch around 4000 Hz that recovers at 8000 Hz is the classic fingerprint of noise damage, seen in factory workers, generator operators, drivers of loud rickshaws and people who play music loud through earphones.
One ear much worse than the other, called asymmetric loss, is always worth a doctor’s review, sometimes with an MRI.
Myth: hearing loss is just part of getting old and nothing helps
Age does thin hearing, but that’s not the same as “nothing helps.” Hearing aids, managing wax, protecting the ears from noise and simple communication habits make a real difference. Untreated hearing loss is linked with isolation and a faster decline in thinking in later life. People believe the myth partly out of pride and partly because older, bulky hearing aids gave them a bad name. The signs families miss in older relatives guide covers that side.
When a hearing result means see a doctor today
Sudden hearing loss in one ear, over hours or up to three days, is an emergency for the ear. It needs a doctor, ideally an ENT specialist, the same day, because early care gives the best chance of recovery. Also go the same day with ear pain plus fever, discharge with swelling behind the ear, dizziness with vomiting, a face that droops on one side, or hearing loss after a head injury. Never put oil, garlic, sticks or anything else into the ear, and don’t start or stop any medicine on your own; the doctor decides.
How to prepare for an audiogram
- Avoid loud noise for at least a day before: no loud music, weddings with speakers, or noisy work if you can help it. Noise can temporarily lower your results.
- Don’t dig out wax with buds or pins. If you think wax is blocking the ear, the clinic can check and clear it first.
- Go when you’re well. A cold or blocked nose can cause fluid behind the drum and a temporary conductive loss.
- Bring a list of your medicines and any earlier audiograms for comparison.
- Answer honestly. Press the button even for the faintest beep; guessing or waiting for a clear sound both skew the result.
A quick whisper test at home can hint that a proper audiogram is due, though it can’t replace one. More report guides are in Lab Reports Decoded.
Surprising facts about hearing
Did you know? The cochlea has only around 15,000 hair cells per ear, and once they’re destroyed by noise, humans can’t grow them back. And “speech banana” is a real term: sketched on the audiogram, the everyday sounds of speech form a banana-shaped band across the middle.
Audiogram questions people ask most
What is a normal hearing range on an audiogram?
Marks between about 0 and 20 or 25 dB across the pitches are usually read as normal. Your clinic’s report will state the cut-off it uses.
What do X and O mean on a hearing test?
O is the right ear and X is the left ear, both tested through headphones. Bone conduction uses brackets or arrow symbols.
What does 40 dB hearing loss mean?
You need sounds to be about 40 dB before you hear them, which is at the edge of mild and moderate loss. Soft speech and group conversation become hard.
What is the air-bone gap?
It’s the space between the air-conduction and bone-conduction marks. A gap of more than about 10 dB suggests a conductive problem in the outer or middle ear.
Can sensorineural hearing loss be reversed?
Usually not, though sudden sensorineural loss sometimes recovers with prompt medical care. Hearing aids help most people with lasting loss.
What does a 4000 Hz notch mean?
A dip at 4000 Hz that recovers at 8000 Hz is typical of noise damage. Protect your ears from further noise and ask about a follow-up test.
What is the difference between an audiogram and tympanometry?
An audiogram measures how softly you can hear. Tympanometry checks how the eardrum moves, which helps spot fluid, blockage or a hole.
Can ear wax affect a hearing test?
Yes. Heavy wax can cause a mild conductive loss. The clinic should check your ears before testing.
Is sudden hearing loss in one ear an emergency?
Yes. See a doctor the same day, because early care improves the chance of getting hearing back.
How long does a hearing test take?
A basic pure-tone audiogram takes about 20 to 30 minutes, longer with speech tests and tympanometry.
Can children have an audiogram?
Yes, adapted for age. Babies and very young children get other tests, such as the newborn hearing screen, that don’t need a button press.
Does ringing in the ear show on an audiogram?
Tinnitus itself doesn’t show, but the hearing loss that often comes with it does. The audiologist may test it separately.