Pure Tone Audiometry (PTA): The Hearing Test Explained

If your ears feel muffled, you keep asking people to repeat themselves, or a doctor has suggested a hearing check, pure tone audiometry is the test you will most likely be given. Pure tone audiometry (PTA) is the standard hearing test: you sit in a quiet, sound-treated room, wear a set of headphones, and press a button each time you hear a soft beep at a different pitch. It is painless, usually takes about 20 to 30 minutes, and the results are drawn onto a simple chart called an audiogram that shows how well each ear hears. At Prudent, this assessment is free and we set aside about 45 minutes, so there is time to test carefully and explain the result to you.

What is pure tone audiometry (PTA)?

PTA stands for Pure Tone Audiometry. The "pure tone" part refers to the type of sound used: a clean, single-pitch beep, more like a steady note than speech or music. During the test an audiologist plays these tones across a range of pitches, from low, rumbly sounds to high, whistly ones, and gradually makes each one softer until they find the quietest level you can just hear. That quietest level is your hearing threshold for that pitch. Because it measures each ear separately and across the speech range, PTA gives a fuller picture than a quick conversation or a phone screening app. If you want a sense of the price and what is included, we cover that in audiometry test cost in India.

How the PTA test works, step by step

• You sit in a quiet, sound-treated room so background noise cannot affect the result.
• You wear headphones over your ears, or small soft foam inserts inside them.
• The audiologist plays soft beeps at different pitches, testing one ear at a time.
• You press a button, raise your hand, or say "yes" every time you hear a tone, even a very faint one.
• A small vibrating device is then rested on the bone behind your ear to test bone conduction.
• Every response is marked on your audiogram to map your hearing threshold at each pitch.

There are no needles, no dyes, and nothing that hurts. The trickiest part for most people is resisting the urge to press the button when they only think a beep might be coming. The whole thing usually takes 20 to 30 minutes. Children, older adults, and people who find sitting still difficult can all do it, and the method is simply adjusted to suit them; for very young children, play-based versions are used. You do not need to fast beforehand or stop any of your medicines.

Air conduction vs bone conduction

PTA measures your hearing in two ways, and the difference between them is what makes it so useful. Air conduction uses the headphones and sends sound the normal route: down the ear canal, through the eardrum and the tiny middle-ear bones, into the inner ear. Bone conduction uses the small vibrator behind your ear, which bypasses the ear canal and middle ear and stimulates the inner ear directly. If your bone conduction is normal but air conduction is reduced, the issue tends to sit in the outer or middle ear, a conductive loss (often linked to wax, fluid, or an infection). If both are reduced together, the loss is usually sensorineural, in the inner ear or hearing nerve. This is how an audiologist tells the two apart, and you can read more in types and causes of hearing loss.

Weber and Rinne: the tuning fork tests

Before the full PTA, a doctor or audiologist may do two quick bedside checks with a tuning fork, a small metal instrument that hums when tapped. These are the Weber and Rinne tests. They take seconds and need no machine, so they are handy as a first screen, but they only give a rough impression. They cannot measure how much hearing you have lost or plot an audiogram, which is why pure tone audiometry remains the fuller test.

• Weber test: the humming fork is placed in the middle of your forehead. If the sound seems louder in one ear, that gives a hint about the type of loss (with a conductive loss the sound tends to move toward the poorer ear; with a sensorineural loss it tends to move toward the better ear).
• Rinne test: the fork is held first on the bone behind your ear, then beside your ear, to compare which is louder. Normally the sound beside the ear is louder; if the bone is louder, it can suggest a conductive problem.
• Both are screening tools only: useful clues, not a measurement and not a diagnosis on their own.

What your audiogram shows

The result of a PTA is a graph called an audiogram, and two things are plotted on it: loudness and pitch. Loudness is measured in decibels (dB) up the side of the chart, with quiet sounds near the top and loud sounds lower down. Pitch, or frequency, is measured in hertz (Hz) across the bottom, with low pitches (a bass drum, a deep voice) on the left and high pitches (a bird, a doorbell, the soft "s" and "th" sounds in speech) on the right; you can see how the ear picks up this range in how hearing works and the parts of the ear. Your thresholds are marked with symbols, usually an "O" for the right ear and an "X" for the left. The lower the marks sit, the louder a sound has to be before you hear it. We walk through a real chart symbol by symbol in understanding your audiogram.

• Marks near the top of the chart (roughly 0 to 25 dB) mean hearing in the normal range.
• Marks that sit lower show the degree of loss, described as mild, moderate, severe, or profound.
• A dip mainly on the right side of the chart is a high-frequency loss, common with age and noise, and it can make speech sound mumbled even when it seems loud enough.
• A gap between the air conduction and bone conduction marks points to a conductive component that a doctor may be able to treat.

Who should have a PTA test?

• Anyone noticing the everyday signs you need a hearing test: asking people to repeat themselves, or turning the TV up louder than others prefer.
• You struggle to follow conversation in noisy places like restaurants or family gatherings.
• You have constant ringing or buzzing in your ears (tinnitus), which often travels alongside hearing loss.
• You work around loud machinery, use earphones at high volume, or have had heavy noise exposure.
• You are over 60, or a parent wondering about a child's speech, responses, or school performance.
• A doctor has asked for a baseline hearing test, or one is needed before fitting a hearing aid.

When to see a doctor

A hearing test measures hearing; it does not treat the cause behind it. Prudent is an audiology clinic, so anything that needs medicine or surgery is something we will refer to an ENT doctor. Our role is to measure any effect on your hearing and, if a loss remains, to help with hearing-aid and rehabilitation solutions. Most hearing changes are not emergencies, but a few warning signs deserve prompt medical attention. See a doctor without delay if you notice any of the red flags below.

• Sudden hearing loss in one or both ears, especially over hours or a single day. This should be treated as urgent, so see a doctor the same day, and read sudden or noise-induced hearing loss.
• Ear pain, discharge, fever, or a blocked feeling that follows a cold or infection.
• Hearing loss in only one ear, or a hearing change that comes with dizziness, spinning, or weakness on one side of the face.
• Ringing in one ear only, or any hearing change after a head injury.

"A hearing test is not a verdict, it is information. Knowing what your ears can and cannot hear is simply the first step toward hearing more of the life around you."

Booking a PTA test at Prudent

Pure tone audiometry is the core of what we do. A qualified audiologist runs the full test, air and bone conduction, in a sound-treated room, then explains your audiogram in plain language the same day. The assessment is free and takes about 45 minutes, with clinics in Pune, Delhi and Bengaluru (see /locations). If the result points to something that needs medical or surgical care, we will guide you to an ENT doctor. If it shows a hearing loss that a device can help with, we can talk through the options, keeping in mind that hearing aids manage hearing loss rather than cure it, though for the right person they can make a genuine difference. There is never any pressure to buy. To book your free /hearing-test, or to ask a question first, reach us at /contact, and if you are already exploring devices, our range is explained under /hearing-aids.