Reading an audiogram can feel a little like decoding a treasure map, except the treasure is your hearing health and the “X” may literally mark your left ear. The good news? An audiogram is not nearly as mysterious as it looks. Once you understand the graph, symbols, and common result patterns, those dots, circles, X marks, brackets, and lines start telling a very clear story.
An audiogram is the chart produced after a hearing test, usually a pure-tone audiometry test. It shows the softest sounds you can hear at different pitches, or frequencies. Audiologists use it to identify the degree, type, and pattern of hearing loss. In plain English, it answers three big questions: How quiet a sound can you hear? Which pitches are affected? And does the problem seem to involve the outer, middle, inner ear, or hearing nerve pathway?
This guide explains how to read an audiogram step by step, including the graph, symbols, air conduction, bone conduction, speech results, and what common patterns may mean.
What Is an Audiogram?
An audiogram is a visual record of hearing thresholds. A threshold is the softest level at which you can hear a sound at least some of the time. During testing, you usually wear headphones or insert earphones and respond whenever you hear a beep. The audiologist tests one ear at a time across several frequencies.
The result is plotted on a graph. Each mark shows how loud a sound had to be before you detected it. Lower numbers mean better hearing because you could hear softer sounds. Higher numbers mean the sound had to be louder before you noticed it.
Think of it like a volume knob. If you can hear a tone when the volume is barely on, your threshold is low. If the tester has to crank the sound up like your neighbor’s lawn mower at 7 a.m., your threshold is higher.
How to Read the Audiogram Graph
The horizontal axis: pitch or frequency
The horizontal line across the top or bottom of an audiogram shows frequency, measured in hertz (Hz). Frequency is the pitch of a sound. Low-frequency sounds are deep, like thunder, a bass drum, or a large dog’s bark. High-frequency sounds are sharp, like birdsong, speech consonants, alarms, or the tiny electronic beep that somehow becomes impossible to ignore once you notice it.
Most standard audiograms test frequencies such as 250, 500, 1000, 2000, 4000, and 8000 Hz. Some tests also include 3000 and 6000 Hz, especially when checking for noise-related hearing changes.
The vertical axis: loudness or hearing level
The vertical line shows loudness, measured in decibels hearing level, written as dB HL. Here is the part that surprises many people: the graph is arranged with softer sounds near the top and louder sounds lower down. So, on an audiogram, marks closer to the top usually mean better hearing, while marks farther down mean poorer hearing.
This can feel upside down at first. But audiologists are looking for the quietest sound you can hear. A threshold at 10 dB HL is excellent because the sound did not need to be loud. A threshold at 70 dB HL means the sound had to be much louder before you detected it.
Common Audiogram Symbols Explained
Audiograms use symbols to show which ear was tested and how the sound was delivered. Most charts include a legend, and you should always check it because clinics may vary slightly. However, many audiograms use these common symbols:
Air conduction symbols
Air conduction testing sends sound through earphones or headphones. The sound travels through the outer ear, eardrum, middle ear, inner ear, and hearing nerve. It tests the entire hearing pathway.
- O usually represents the right ear by air conduction.
- X usually represents the left ear by air conduction.
- Red is commonly used for the right ear.
- Blue is commonly used for the left ear.
An easy memory trick: “O” looks like the round shape of the word “right” if you are very generous and have not had enough coffee. More practically, remember: right ear often gets the red circle; left ear often gets the blue X.
Bone conduction symbols
Bone conduction testing uses a small vibrator placed behind the ear or on the forehead. This bypasses the outer and middle ear and sends vibration directly to the inner ear. Bone conduction helps determine whether hearing loss is conductive, sensorineural, or mixed.
- < or [ may represent right-ear bone conduction.
- > or ] may represent left-ear bone conduction.
- Brackets often indicate masked bone conduction, depending on the clinic’s notation.
Masked symbols
Masking is used when there is a chance that the ear not being tested might hear the sound. The audiologist plays noise into the non-test ear so the result is truly from the intended ear. Masked symbols may include triangles, squares, or brackets, depending on the test type and chart style.
If you see symbols that look unfamiliar, do not panic. Audiograms are supposed to include a key or legend. If the symbols look like a tiny secret alphabet, ask the audiologist to translate them. That is part of the appointment, not a bonus feature.
Degrees of Hearing Loss on an Audiogram
Hearing level is commonly grouped into categories. Exact labels can vary slightly by clinic, age group, and professional guideline, but many adult audiograms use ranges similar to these:
| Hearing Level | Approximate Range | What It May Mean |
|---|---|---|
| Normal or near normal | 0–25 dB HL | Soft sounds are generally heard well. |
| Mild hearing loss | 26–40 dB HL | Soft speech may be missed, especially in noise. |
| Moderate hearing loss | 41–55 dB HL | Conversation may be difficult without amplification. |
| Moderately severe hearing loss | 56–70 dB HL | Speech often needs to be loud and clear. |
| Severe hearing loss | 71–90 dB HL | Only loud sounds may be heard. |
| Profound hearing loss | 91+ dB HL | Very loud sounds may be difficult or impossible to detect. |
For children, even small degrees of hearing loss can affect speech and language development, so pediatric results are interpreted carefully. Adults should also take “mild” hearing loss seriously. Mild does not mean meaningless. It may mean you hear voices but miss clarity, especially consonants like S, F, T, K, and TH.
Air Conduction vs. Bone Conduction: The Key to Type of Hearing Loss
The difference between air conduction and bone conduction is one of the most important parts of audiogram interpretation.
Conductive hearing loss
Conductive hearing loss happens when sound has trouble traveling through the outer or middle ear. Causes may include earwax blockage, fluid behind the eardrum, ear infections, eardrum problems, or issues with the tiny middle-ear bones.
On an audiogram, conductive hearing loss often shows bone conduction thresholds that are better than air conduction thresholds. The space between them is called an air-bone gap. A significant air-bone gap suggests that the inner ear may hear better than the full pathway allows.
Sensorineural hearing loss
Sensorineural hearing loss involves the inner ear, cochlea, hair cells, or hearing nerve pathway. Common causes include aging, noise exposure, genetics, certain medications, infections, and other medical conditions.
On an audiogram, air conduction and bone conduction thresholds are both reduced, and they generally line up without a large air-bone gap. In other words, bypassing the outer and middle ear does not significantly improve the result.
Mixed hearing loss
Mixed hearing loss has both conductive and sensorineural components. The inner ear has some hearing loss, and there is also an outer or middle-ear problem making sound transmission worse. On the audiogram, both air and bone conduction thresholds are elevated, but air conduction is still worse than bone conduction.
Common Audiogram Patterns and What They Suggest
The shape of the audiogram matters. Audiologists call this the configuration of hearing loss. It can provide clues about what is happening.
Flat hearing loss
A flat audiogram means hearing thresholds are similar across low, middle, and high frequencies. Speech may sound evenly quieter rather than selectively muffled. Flat patterns can appear in different types of hearing loss, so the cause depends on the full test results and medical history.
Sloping high-frequency hearing loss
A sloping audiogram means hearing is better in the low frequencies and worse in the high frequencies. This is common with age-related hearing loss and many forms of noise-related hearing damage. People with this pattern often say, “I can hear people talking, but I cannot understand what they are saying.” Translation: vowels may come through, but consonants vanish like socks in a dryer.
Noise notch
A noise notch is a dip, often around 3000, 4000, or 6000 Hz, with better hearing at nearby frequencies. It can be associated with noise exposure, especially from machinery, firearms, loud music, or occupational noise. A notch does not automatically prove the cause, but it is an important clue.
Rising hearing loss
A rising configuration means low-frequency hearing is worse than high-frequency hearing. This is less common than high-frequency loss and may appear with certain inner-ear conditions. People with this pattern may struggle with deeper voices, background rumble, or some vowel sounds.
Cookie-bite hearing loss
A cookie-bite pattern shows poorer hearing in the middle frequencies, with better hearing in low and high frequencies. It gets its nickname because the graph looks as if someone took a bite out of the middle. Audiology: serious science, snack-based imagery.
What Is the Speech Banana?
The speech banana is an area on the audiogram where many speech sounds fall. It is called a banana because of its curved shape. Vowel sounds tend to be lower in frequency and louder, while consonants are often higher in frequency and softer.
This matters because speech understanding is not only about volume. If your audiogram shows high-frequency hearing loss, you may hear that someone is speaking but miss words like “sat,” “fat,” “cat,” and “that.” The sentence is technically audible but mentally exhausting, like trying to read a text message with every third letter removed.
Pure-Tone Average and Speech Test Results
An audiogram may include more than tone thresholds. Many hearing evaluations also include speech testing.
Pure-tone average
The pure-tone average, or PTA, is often calculated using thresholds at 500, 1000, and 2000 Hz. Some clinics include 3000 Hz, depending on the purpose of testing. PTA gives a quick summary of hearing sensitivity in the main speech range.
Speech reception threshold
The speech reception threshold, or SRT, is the softest level at which you can repeat familiar two-syllable words, such as “baseball” or “hotdog.” The SRT should generally agree with the pure-tone average. If it does not, the audiologist may investigate further.
Word recognition score
The word recognition score measures how clearly you understand speech when words are presented at a comfortable loudness. This score is usually shown as a percentage. A person may have similar hearing thresholds but different word recognition scores, which is one reason two people with “moderate hearing loss” may have very different real-world listening experiences.
Example Audiogram Results Explained
Example 1: Normal hearing
Suppose the right ear has O marks between 5 and 20 dB HL from 250 through 8000 Hz, and the left ear has X marks in the same range. This usually suggests normal or near-normal hearing sensitivity in both ears. If the person still struggles in noisy restaurants, additional testing may be needed because standard audiograms do not explain every listening difficulty.
Example 2: High-frequency sensorineural hearing loss
Imagine thresholds are 15 dB HL at 500 Hz, 20 dB HL at 1000 Hz, 35 dB HL at 2000 Hz, 55 dB HL at 4000 Hz, and 65 dB HL at 8000 Hz. Bone conduction follows the same general pattern. This suggests sloping high-frequency sensorineural hearing loss. The person may hear low-pitched sounds well but miss speech clarity, birds, doorbells, or children’s voices.
Example 3: Conductive hearing loss
Suppose air conduction thresholds are around 45 dB HL, but bone conduction thresholds are around 10 dB HL. That air-bone gap suggests conductive hearing loss. Depending on the cause, medical treatment may help, so referral to an ear, nose, and throat specialist may be recommended.
Example 4: Mixed hearing loss
If bone conduction thresholds are around 40 dB HL and air conduction thresholds are around 65 dB HL, there may be mixed hearing loss. The inner ear is not hearing normally, and sound is also being blocked or reduced before it reaches the inner ear.
When Audiogram Results Need Follow-Up
You should discuss any hearing test result with a qualified professional, but some situations deserve faster attention. Sudden hearing loss, one-sided hearing changes, major asymmetry between ears, ear pain, drainage, dizziness, ringing in one ear, or a feeling of fullness should be evaluated promptly. Sudden sensorineural hearing loss can be time-sensitive.
Also, do not ignore a workplace audiogram that shows a threshold shift. In hearing conservation programs, changes from a baseline audiogram may signal noise-related damage and the need for better hearing protection, retesting, or medical review.
Can You Read an Online Audiogram?
Online hearing tests can be useful for awareness, but they are not the same as a clinical audiogram. Home environments are noisy, headphones vary, device volume settings are not calibrated, and results may be inaccurate. A professional audiogram uses calibrated equipment in a controlled setting. Use online tests as a screening tool, not a final diagnosis.
Tips for Discussing Your Audiogram With an Audiologist
Bring real-life listening examples to your appointment. Do you struggle with speech in restaurants? Do you turn up the TV? Do people seem to mumble? Do high-pitched voices sound unclear? These details help connect the graph to daily life.
Ask your audiologist these questions:
- What type of hearing loss do I have?
- Is it mild, moderate, severe, or profound?
- Is one ear worse than the other?
- Is there an air-bone gap?
- How are my word recognition scores?
- Would hearing aids, medical treatment, monitoring, or protection help?
- How often should I repeat testing?
Experience-Based Section: What Reading an Audiogram Feels Like in Real Life
The first time many people see an audiogram, they expect a simple pass-or-fail result. Instead, they get a graph with red circles, blue X marks, brackets, arrows, and numbers marching down the page. It can feel oddly personal, like your ears just handed in a report card and nobody warned you there would be math.
A common experience is confusion over the vertical scale. People naturally assume “higher on the chart” means “worse,” because that is how many graphs work. On an audiogram, the opposite is true. The closer your marks are to the top, the softer the sounds you heard. Once that clicks, the whole chart becomes easier. You start seeing the audiogram not as a medical mystery but as a map of what your ears can detect.
Another real-world surprise is that hearing loss does not always feel like reduced volume. Many people with high-frequency loss say, “I hear fine; people just mumble.” That statement is extremely common. What is happening is that parts of speech are missing. Vowels carry loudness, while consonants carry clarity. So the person hears sound but loses detail. It is like listening to someone speak through a wall made of mashed potatoes: the rhythm is there, but the words are not crisp.
People also discover that quiet rooms can be misleading. Someone may perform fairly well in a one-on-one conversation at home but struggle at a busy family dinner. Background noise competes with speech, and the brain has to work harder to fill in missing sounds. This listening effort can lead to fatigue. After a long day of “What?” and “Can you repeat that?” even patient people may feel drained.
For some, seeing the audiogram is validating. It explains why phone calls are harder, why subtitles have become a trusted friend, or why certain voices disappear in group conversations. The chart turns vague frustration into something measurable. That can be a relief. No, you are not imagining it. No, everyone did not suddenly enroll in Advanced Mumbling 101.
For others, the audiogram starts a practical conversation. If the results show conductive hearing loss, the next step may involve checking for wax, fluid, infection, or middle-ear issues. If the results show sensorineural hearing loss, the discussion may shift toward hearing aids, communication strategies, hearing protection, or monitoring. If the loss is asymmetric or sudden, medical follow-up becomes especially important.
The most useful mindset is curiosity, not fear. An audiogram is not a verdict. It is information. It can guide better choices: protecting your ears at concerts, using properly fitted hearing devices, treating medical causes when possible, or simply understanding why noisy places have become more difficult. Once you know how to read the graph, you can participate more confidently in your own care.
Conclusion
Learning how to read an audiogram gives you a clearer view of your hearing health. The graph shows frequency from low to high, loudness from soft to loud, and thresholds for each ear. Symbols such as O, X, brackets, triangles, and squares show which ear was tested and whether sound traveled by air conduction or bone conduction. The pattern of results can suggest normal hearing, conductive hearing loss, sensorineural hearing loss, mixed hearing loss, or specific configurations such as sloping, flat, rising, or notched loss.
The most important takeaway is simple: an audiogram is not just a chart. It is a practical guide to how you hear the world. If the results show hearing loss, an audiologist can explain what it means and help you choose the next step. Your ears may not come with subtitles, but with a well-read audiogram, you at least get a very useful instruction manual.