Audiometry & Hearing Test at Chughtai Lab

Introduction to Audiometry & Hearing Test at Chughtai Lab

An Audiometry & Hearing Test at Chughtai Lab is a highly specialized, non-invasive diagnostic procedure designed to evaluate an individual’s hearing capacity across a broad spectrum of frequencies and intensities. Hearing is a complex physiological process involving the outer ear, middle ear, inner ear (cochlea), vestibulocochlear nerve (eighth cranial nerve), and the auditory cortex of the brain. Any disruption along this pathway can lead to hearing impairment, which can significantly affect communication, cognitive health, and overall quality of life. By utilizing state-of-the-art audiometric equipment, Chughtai Lab provides precise assessments that help clinicians pinpoint the exact nature, degree, and configuration of hearing loss.

The test works by delivering calibrated acoustic signals through specialized headphones (air conduction) and bone vibrators (bone conduction). These signals range from very low-pitched tones to high-pitched sounds, measured in Hertz (Hz), and vary in volume, measured in decibels (dB). The primary objective of an Audiometry & Hearing Test is to establish the quietest sounds a patient can hear at each frequency, known as the hearing threshold. This detailed evaluation is crucial for distinguishing between conductive hearing loss (arising from problems in the outer or middle ear), sensorineural hearing loss (resulting from damage to the inner ear or auditory nerve), and mixed hearing loss (a combination of both).

At Chughtai Lab, this diagnostic service is performed in a controlled, soundproof environment to eliminate ambient noise that could skew the results. The clinical importance of this test cannot be overstated; it serves as the foundation for prescribing hearing aids, planning surgical interventions for middle ear pathologies, monitoring ototoxic drug regimens, and diagnosing serious neurological conditions such as vestibular schwannomas. Patients benefit from a highly standardized testing protocol that ensures reliable, reproducible results, enabling timely and effective therapeutic interventions.

Clinical Procedure: What to Expect

Patient Preparation

Proper preparation is essential to ensure the accuracy of an Audiometry & Hearing Test at Chughtai Lab. Patients are advised to adhere to the following guidelines prior to their appointment:

• Avoid Loud Noises: Patients should avoid exposure to loud noises, such as concerts, heavy machinery, or personal audio devices at high volumes, for at least 16 hours before the test to prevent temporary threshold shifts.
• Otoscopic Examination: It is highly recommended to have the ear canals checked for impacted cerumen (earwax) prior to the test. Excessive earwax can obstruct sound waves and lead to inaccurate conductive hearing loss findings.
• Medical History: Bring all relevant medical records, including previous hearing test results, details of past ear surgeries, history of noise exposure, and a list of current medications (especially known ototoxic drugs).
• Symptom Documentation: Be prepared to describe any symptoms such as tinnitus (ringing in the ears), vertigo (dizziness), ear pain, fullness, or sudden changes in hearing.
• No Fasting Required: There are no dietary restrictions or fasting requirements for this test; patients may eat, drink, and take their routine non-ototoxic medications as usual.

During the Procedure

The Audiometry & Hearing Test is a painless, comfortable, and interactive diagnostic examination. Here is what patients can expect during their visit to Chughtai Lab:

• Patient Positioning: The patient is seated comfortably inside a specially designed, sound-treated booth. This environment is engineered to isolate the patient from external auditory distractions.
• Equipment Setup: The audiologist or trained technician places calibrated over-ear or insert headphones on the patient for air conduction testing. Later, a small bone conduction oscillator is placed on the mastoid bone behind the ear.
• Pure-Tone Testing: The examiner plays a series of pure tones at different frequencies (typically from 125 Hz to 8000 Hz). The patient is instructed to give a signal (such as pressing a button, raising a hand, or saying “yes”) every time they hear a tone, even if it is extremely faint.
• Speech Audiometry: In addition to pure tones, the patient’s ability to hear and understand spoken words is evaluated. The clinician will read a list of words at various volumes, and the patient will be asked to repeat them. This determines the Speech Reception Threshold (SRT) and Word Recognition Score (WRS).
• Bone Conduction Testing: The bone oscillator bypasses the outer and middle ear, transmitting vibrations directly to the cochlea. This step is critical for differentiating between conductive and sensorineural hearing pathways.
• Duration and Safety: The entire procedure typically takes between 20 to 30 minutes. It is completely safe, non-invasive, and carries zero risk of radiation or discomfort.

When is an Audiometry & Hearing Test Performed?

Evaluation of Presbycusis (Age-Related Hearing Loss)

Presbycusis is the gradual, bilateral, progressive high-frequency sensorineural hearing loss associated with aging. Physicians request an Audiometry & Hearing Test when elderly patients report difficulty understanding speech in noisy environments, frequently ask others to repeat themselves, or complain that people are mumbling. The test assists in diagnosing the severity of age-related degeneration of the cochlea or auditory nerve pathways, facilitating timely rehabilitation with hearing aids to prevent cognitive decline and social isolation.

Assessment of Occupational and Noise-Induced Hearing Loss

Prolonged exposure to high-decibel industrial, military, or recreational noise can cause irreversible damage to the hair cells in the cochlea. Clinicians recommend this test for individuals working in high-noise environments (such as construction, aviation, or manufacturing) who experience progressive hearing loss or persistent high-pitched tinnitus. The audiogram typically reveals a characteristic “noise notch” at 4000 Hz, helping occupational health physicians monitor hearing conservation programs and implement protective measures.

Monitoring of Ototoxicity from Pharmacological Agents

Certain essential medications, including aminoglycoside antibiotics (e.g., gentamicin), platinum-based chemotherapeutic agents (e.g., cisplatin), and high-dose loop diuretics, are known to be ototoxic. Oncologists and infectious disease specialists order baseline and serial Audiometry & Hearing Tests to detect early subclinical damage to the cochlear hair cells. Detecting early high-frequency hearing loss allows physicians to modify drug dosages or switch therapies before permanent communication difficulties occur.

Diagnosis of Conductive Hearing Loss in Middle Ear Disorders

Pathologies affecting the outer or middle ear—such as chronic otitis media, otosclerosis, tympanic membrane perforation, fluid accumulation (glue ear), or ossicular chain discontinuity—obstruct the physical transmission of sound. Otolaryngologists request an audiometry test to measure the “air-bone gap,” which is the difference between air conduction and bone conduction thresholds. This diagnostic finding confirms a conductive hearing loss and helps guide surgical interventions or medical management.

Investigation of Sudden Sensorineural Hearing Loss (SSNHL)

Sudden Sensorineural Hearing Loss (SSNHL) is defined as a rapid loss of hearing of at least 30 decibels across three contiguous frequencies, occurring within a 72-hour period. It is considered a medical emergency that requires immediate diagnostic evaluation. An urgent Audiometry & Hearing Test is performed to confirm the sensorineural nature of the loss and rule out simple conductive issues like earwax. Prompt diagnosis allows for the immediate initiation of high-dose corticosteroid therapy, which significantly improves the chances of hearing recovery.

What Does an Audiometry & Hearing Test Detect?

An Audiometry & Hearing Test at Chughtai Lab is highly sensitive and can detect a wide range of physiological and pathological conditions affecting the auditory system. The clinical findings include:

• Normal hearing thresholds across all tested frequencies (0 to 20 dB HL).
• Mild conductive hearing loss (26 to 40 dB HL) due to middle ear fluid or Eustachian tube dysfunction.
• Moderate sensorineural hearing loss (41 to 55 dB HL) indicating cochlear hair cell damage.
• Moderately severe hearing loss (56 to 70 dB HL) affecting daily communication.
• Severe hearing loss (71 to 90 dB HL) requiring powerful amplification or cochlear implant evaluation.
• Profound hearing loss (greater than 90 dB HL) where speech is virtually inaudible.
• Bilateral symmetrical sensorineural hearing loss, typical of presbycusis or systemic ototoxicity.
• Unilateral sensorineural hearing loss, raising suspicion for localized pathologies like vestibular schwannoma.
• An air-bone gap greater than 10 dB, confirming a conductive hearing impairment.
• A characteristic noise-induced hearing loss notch at 4000 Hz.
• Low-frequency sensorineural hearing loss, commonly associated with early-stage Meniere’s disease.
• Flat audiometric configuration, indicating equal hearing loss across all frequencies.
• Sloping audiometric configuration, where high-frequency hearing is significantly worse than low-frequency hearing.
• Rising audiometric configuration, where low frequencies are more severely affected than high frequencies.
• Cookie-bite (mid-frequency) hearing loss, often indicative of congenital or hereditary hearing impairment.
• Impaired Speech Reception Threshold (SRT) matching the pure-tone average.
• Reduced Word Recognition Score (WRS), indicating poor speech discrimination ability despite amplification.
• Abnormal bone conduction thresholds pointing to cochlear or retrocochlear pathology.
• Asymmetrical hearing loss requiring advanced neuroimaging (such as MRI) to rule out retrocochlear lesions.
• Conductive overlay in mixed hearing loss, combining middle ear and inner ear pathologies.
• Hyperacusis or abnormal loudness recruitment, suggesting cochlear damage with compromised dynamic range.
• Pseudohypacusis (non-organic or functional hearing loss) detected through inconsistent response patterns.
• Auditory processing abnormalities where peripheral hearing is normal but central integration is impaired.
• Preserved bone conduction thresholds with impaired air conduction, confirming intact inner ear function.

Turnaround Time and Report Access at Chughtai Lab

Chughtai Lab is widely recognized for its efficient diagnostic workflows and rapid reporting systems. Upon completion of the Audiometry & Hearing Test, the raw data is meticulously analyzed and plotted on an audiogram by a qualified audiologist. Because the test is completed in real-time, the preliminary audiogram is often compiled immediately. The final, verified diagnostic report, complete with clinical interpretations of air conduction, bone conduction, and speech audiometry, is typically ready within a few hours of the procedure.

Patients can access their diagnostic reports conveniently through multiple digital channels. Chughtai Lab offers an online report portal on their official website, where patients can log in using their lab ID and password. Additionally, reports can be accessed and downloaded via the Chughtai Lab Mobile App, or received directly through WhatsApp. For those who prefer physical copies, printed reports can be collected from the diagnostic center where the test was performed. This seamless access ensures that patients can promptly share their results with their referring otolaryngologist or primary care physician.

Audiometry & Hearing Test Findings Overview

The following table outlines the key parameters evaluated during an Audiometry & Hearing Test, comparing normal physiological responses with potential pathological findings:

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
Outer and External Auditory Canal	Patent canal, free of obstruction, healthy external auditory meatus.	Impacted cerumen, otitis externa, foreign body, canal stenosis.
Middle Ear & Tympanic Membrane	Intact, mobile tympanic membrane; normal ossicular chain mobility.	Tympanic membrane perforation, otitis media with effusion, otosclerosis.
Inner Ear (Cochlea)	Healthy outer and inner hair cells; normal transduction of sound waves.	Cochlear hair cell damage, presbycusis, noise-induced cochlear injury.
Auditory Nerve (CN VIII)	Symmetrical neural transmission of auditory signals to the brainstem.	Vestibular schwannoma (acoustic neuroma), auditory neuropathy.
Pure Tone Air Conduction	Thresholds between 0 and 20 dB HL across all frequencies (125-8000 Hz).	Thresholds > 25 dB HL, indicating conductive, sensorineural, or mixed loss.
Pure Tone Bone Conduction	Thresholds equal to air conduction thresholds, within 0-20 dB HL.	Impaired bone conduction thresholds, indicating sensorineural damage.
Air-Bone Gap (ABG)	Difference between air and bone conduction thresholds is less than 10 dB.	ABG > 10 dB, confirming a conductive hearing loss component.
Speech Reception Threshold (SRT)	Consistent with the Pure Tone Average (PTA) within +/- 6 dB.	Significantly elevated SRT, indicating poor sensitivity to speech.
Word Recognition Score (WRS)	Excellent speech discrimination (90% to 100% correct repetition).	Poor WRS (< 70%), indicating retrocochlear pathology or severe cochlear distortion.

Note: Diagnostic findings should always be interpreted by a qualified healthcare professional together with the patient’s symptoms, medical history, physical examination, laboratory investigations, previous imaging studies, and other relevant clinical information. Additional investigations or specialist consultation may be recommended depending on the findings.

Why Choose Chughtai Lab for Audiometry & Hearing Test?

• Experienced Healthcare Professionals: Tests are conducted and interpreted by highly qualified, clinically trained audiologists.
• Patient-Focused Care: Personalized attention is given to every patient, ensuring comfort and clarity throughout the testing process.
• Quality Diagnostic Services: Chughtai Lab adheres to strict international quality control standards for diagnostic accuracy.
• Professional Reporting: Comprehensive, easy-to-read audiograms with detailed clinical interpretations are provided.
• Modern Diagnostic Approach: State-of-the-art, regularly calibrated audiometers and soundproof booths are utilized.
• Comfortable Environment: Modern, clean, and quiet diagnostic clinics designed to minimize patient anxiety.
• Convenient Location: A vast network of diagnostic centers across Pakistan, making services easily accessible.
• Commitment to Accurate Diagnosis: Dedicated to providing precise and reliable results to guide effective medical and surgical treatments.