Somewhere in a drawer, or in a patient portal you logged into once, there may be a single page that maps how you hear. It has a grid, some red circles, some blue X's, and lines that tend to sag toward the bottom right. Most people get it handed over in a quick appointment, nod, and never look at it again. That's a shame, because once you can read it, it's one of the most personal documents you'll ever own. It shows which voices you lose first, why your partner says you only hear what you want to, and why the grandkids sound like they're mumbling while the TV news anchor comes through fine.

This article teaches you to read that page. It won't take long. And afterward, a lot of small frustrations in your life may suddenly make sense.

The chart is upside down on purpose

The first thing that confuses everyone: on an audiogram, down is worse.

The vertical axis is labeled Hearing Level in decibels (dB HL). It starts near the top at -10 or 0 and climbs as you go down the page, usually to 110 or 120. Each mark you see is a threshold, the softest level at which you detected a tone about half the time it played. If your mark sits near the top, you caught the tone when it was very faint. If it sits lower, the tone had to get louder before you noticed it.

So a line that drops as it moves across the page isn't a graph of something going down. It shows sounds that have to come up before they reach you.

One quiet detail is worth knowing: 0 dB HL doesn't mean silence. It's a reference point set by the average thresholds of young adults with healthy hearing. That's why some people score slightly better than zero, at -5 or -10. The scale compares you with typical human hearing, not with physics.

Left to right: from rumble to hiss

The horizontal axis is frequency, measured in hertz (Hz), and it usually runs from 250 Hz on the left to 8000 Hz on the right. Read it like a piano keyboard. On the left are deep sounds: a refrigerator hum, the bottom of a man's voice, the vowel in "oo." On the right are bright, thin sounds: birdsong, a microwave beep, the hiss of an "s."

This axis is where the audiogram starts explaining your life, because speech isn't one sound. It's a braid of low and high frequencies, and they don't carry the same weight.

The O's, the X's, and the brackets

Most audiograms use a standard set of symbols:

  • O (often red) is your right ear, tested through headphones or earphones. This is called air conduction.
  • X (often blue) is your left ear, tested the same way.
  • < and > (or [ and ] when a masking noise was used) are bone conduction results. These come from a small vibrator placed behind the ear that sends sound through the skull straight to the inner ear, skipping the ear canal and middle ear.

That last pair is easy to ignore, but it holds one of the chart's most useful clues. We'll get to it.

The shape is the story

Audiologists don't read an audiogram one dot at a time. They read its shape, the way you'd recognize a friend's handwriting. A few shapes come up again and again.

The gentle downward slope. The line is near the top on the left and drifts lower toward the right. This is the classic pattern of age-related hearing change (presbycusis). The delicate outer hair cells that handle high frequencies sit at the base of the cochlea, and over a lifetime they tend to wear first. Someone with this slope often says, "I can hear you, I just can't understand you." That's not an excuse. It's accurate. Vowels, which are low-pitched and carry most of the loudness, still arrive. Consonants like s, f, th, and k, which are high-pitched, quiet, and carry most of the meaning, don't.

The notch. The line holds steady, dips sharply somewhere between 3000 and 6000 Hz (most often around 4000), then partly recovers at 8000. This "noise notch" is a well-known fingerprint of noise exposure: years of power tools, concerts, a loud job, gunfire. The ear canal's natural resonance boosts sound energy in that region, so that's where the cochlea takes the most strain. A notch is worth noticing early, because it shows where damage is starting, often before you feel any difference in daily life.

The flat line. Thresholds sit at about the same level across all frequencies. The causes of this pattern vary more, and it's a good reason to look at the bone-conduction symbols.

The gap between two lines. If your bone-conduction marks sit near the top but your air-conduction O's or X's sit noticeably lower, that's an air-bone gap. It means your inner ear responds well when sound is delivered directly, but something is blocking sound on its way in: wax, fluid behind the eardrum, or a problem with the eardrum or the tiny middle-ear bones. Clinicians generally treat a gap of more than about 10 dB as meaningful. Many causes of this pattern are mechanical, and some can be addressed medically, so it's one of the most hopeful things an audiogram can show.

The speech banana

Some audiograms have a shaded, curved region across the middle of the chart. Clinicians really do call it the speech banana. It marks roughly where the sounds of everyday conversational speech fall in loudness and pitch. Low, louder vowels sit on the left side, and soft, high consonants curve up to the right.

This is the part of the chart that makes the abstract personal. Any part of the banana that sits above your threshold line (softer than you can detect) is speech you're missing. If your line cuts through the right half, that's where s, f, and th live. "Fifty" and "sixty" blur together. Children's and many women's voices, which carry more high-frequency energy, fade first. Your brain fills the gaps, which works until the room gets noisy or you're tired, and then it doesn't.

Seeing that overlap on paper can bring a strange relief. The strain you've felt in conversations wasn't inattention or a lack of caring. It was physics.

What the categories mean (and don't)

You may see a word attached to your results. Commonly used ranges look roughly like this:

  • -10 to 15 dB HL: within normal limits
  • 16 to 25: slight
  • 26 to 40: mild
  • 41 to 55: moderate
  • 56 to 70: moderately severe
  • 71 to 90: severe
  • 91+: profound

Treat these as rough guides, not verdicts. The word "mild" in particular undersells things. A mild loss across the high frequencies can wipe out a large share of consonant information, and it can make a dinner party exhausting. How you function matters more than the label.

Also keep in mind what a pure-tone audiogram can't show. It measures how soft a sound you can detect, not how well you understand speech in noise. Two people with nearly identical charts can have very different experiences in a busy café. That's why a full clinical evaluation also includes speech testing.

Your next moves

  • Get your audiogram in hand today. If you've ever had a hearing test, ask the clinic or check your patient portal for a copy of the actual chart, not just the summary. In many places, including the U.S., you generally have a right to access your own health records.
  • Find your shape. Trace your O's and X's with a finger. Is it a slope, a notch near 4000 Hz, a flat line, or a gap between the air and bone marks? Write that one word at the top of the page.
  • Compare your ears. If one ear's line sits clearly lower than the other, especially by 15 dB or more at several frequencies, write that down and raise it with a hearing professional. Uneven results are worth asking about.
  • Sketch the speech banana. If your chart doesn't have one, search "speech banana audiogram," print an image, and line it up with your results. Circle the speech sounds that fall above your line, then listen for those exact sounds in your next conversation.
  • Bring two questions to your next appointment: "Is there an air-bone gap?" and "How did I do on speech-in-noise testing?" Those two answers fill in most of what the tones alone can't tell you.

Seeing it change over time

An audiogram is a snapshot, and hearing usually changes too slowly for any single snapshot to catch. Audra is built for the gaps between clinic visits. It runs a free at-home pure-tone screening that plots your results in this same familiar format, so you can track your own line over months and notice a dip early. It's a wellness and screening tool, not a substitute for a professional evaluation, but it can tell you when it's time to book one. If you live with ringing, it also offers personalized notched-noise sound enrichment, shaped around your own results. If this article helped you read your chart, you can start your free screening at audra.lumenlabs.works and get one of your own.