Pure tone audiometry detects hearing loss through a standardized evaluation process that measures how a person responds to various sound frequencies. A patient sits inside a soundproof room wearing headphones while a hearing professional sends specific tones to each ear.
The patient signals whenever a tone becomes audible, which allows the professional to establish precise hearing thresholds. This method identifies the quietest sounds a listener can perceive across low, middle, and high pitches. By collecting these baseline measurements, pure tone audiometry offers a reliable path toward understanding subtle changes in hearing clarity and overall ear function.
Testing Pitch Responses Across Sound Waves
Sound travels through the air in waves that vary in frequency, which the ears perceive as pitch. Low frequencies recreate deep sounds like bass drums, while high frequencies match whistling or birdsong. During an evaluation, a hearing health professional plays single pure tones at single frequencies to test ear sensitivity.
The test moves systematically from low pitches to high pitches in a calm environment. When patients press a button or raise a hand upon hearing a tone, the care provider records the exact moment of perception. Isolating individual frequencies ensures that specific pitch gaps in perception become clear almost immediately.
Measuring Softest Sounds People Can Hear
Determining the softest sound a person perceives creates the foundation of accurate hearing measurement. The examiner starts by playing a clear tone at a comfortable volume and then lowers the volume step by step. Once the sound disappears, the clinician raises the volume slightly until the patient notices the sound again.
The lowest decibel level where a patient hears the pitch at least half of the time marks the threshold. Repeating this careful lowering and raising process across every pitch provides consistent baseline measurements. These numerical thresholds reveal whether a person hears normal whisper levels or requires amplified sound.
Comparing Air Conduction And Bone Paths
Sound reaches the inner ear through two separate physical pathways during a full test. Air conduction tests send sound through headphones into the outer ear, ear canal, and middle ear. Bone conduction tests place a gentle vibrating device behind the ear to send sound directly through the skull bone to the inner ear.
Comparing these two pathways helps a hearing health professional determine where an obstruction or damage exists. If air conduction shows reduced hearing while bone conduction remains normal, the outer or middle ear contains a block. Matching results across both pathways indicate that the inner ear itself requires focused clinical attention.
Plotting Results On A Detailed Chart
Every response during the evaluation builds a comprehensive visual graph called an audiogram. The horizontal axis displays sound pitch from low to high, while the vertical axis tracks loudness in decibels. Symbols mark the precise hearing threshold for each ear at every tested frequency.
Blue Xs represent the left ear, while red circles mark the right ear on standard charts. Connecting these marked points creates a visual line that clearly reveals the pattern of hearing ability. A flat line near the top shows normal hearing, whereas a downward slope highlights difficulty perceiving higher pitches during everyday conversations.
Pinpointing Specific Types Of Loss
Analyzing the completed graph allows hearing health professionals to identify the exact category of hearing reduction. Sensorineural hearing loss appears when the inner ear or auditory nerve suffers damage, showing matching deficits in both air and bone pathways.
Conductive hearing loss occurs when sound cannot travel through the outer or middle ear, showing normal bone conduction alongside reduced air conduction. Mixed hearing loss combines aspects of both conditions, revealing damage in the outer or middle ear as well as the inner ear. Identifying these unique patterns guides care providers toward appropriate medical treatments or custom listening devices.
Partner With Us for Hearing Evaluations
Recognizing subtle changes in speech clarity or everyday hearing comfort is often the first step toward better health. Pure tone audiometry provides clear answers regarding inner ear function and sound perception across all pitches.
Contact us to schedule a personalized evaluation. Our dedicated team guides patients through every step with complete comfort, helping restore confidence in every daily interaction and family connection.