Integrating Assessment Results, Differential Diagnosis & Reporting
Key Takeaways
The cross-check principle (Jerger and Hayes, 1976) requires confirming each result with an independent measure, such as using tympanometry and acoustic reflexes to confirm a conductive component.
An acoustic reflex present at or below a patient's admitted behavioral threshold means the behavioral threshold cannot be accurate and suggests nonorganic hearing loss.
Present OAEs or cochlear microphonic with an absent or severely abnormal ABR and absent reflexes indicate auditory neuropathy spectrum disorder, whereas a retrocochlear lesion typically shows asymmetric loss with poor word recognition and abnormal reflexes.
The Tinnitus and Hearing Survey separates tinnitus, hearing, and sound tolerance complaints, helping the audiologist decide whether amplification or tinnitus-specific management should come first.
Reports should answer the referral question with a clear interpretation and specific recommendations; HIPAA allows sharing with treating providers, but sending reports to schools or employers generally requires written authorization.
Integrating Assessment Results, Differential Diagnosis & Reporting
Individual tests rarely answer the clinical question alone. The Praxis Audiology blueprint asks you to integrate findings to determine the type and severity of auditory and balance impairment, develop recommendations, and distinguish hearing, tinnitus, and sound tolerance problems. You must also document results, generate recommendations based on all findings and patient preferences, and communicate them to patients, families, interpreters, and other professionals.
The Cross-Check Principle
Jerger and Hayes' cross-check principle (1976) says that no single test result should be accepted without confirmation from an independent test. Examples:
- Tympanometry and acoustic reflexes confirm a conductive component suggested by an air-bone gap.
- The speech recognition threshold should agree with the pure-tone average (within about 10 dB); a much better SRT suggests nonorganic hearing loss.
- OAEs and ABR confirm or challenge behavioral thresholds in infants and in patients who cannot give reliable responses.
Determining Type, Degree, and Site of Lesion
- Type: conductive (air-bone gap with normal bone conduction), sensorineural (no significant air-bone gap), or mixed.
- Degree: describe it using a standard scale (for example, mild, moderate, moderately severe, severe, profound) and give the configuration (flat, sloping, rising, notched, cookie-bite).
- Site of lesion: outer or middle ear, cochlea, auditory nerve or brainstem (retrocochlear), or central pathways.
Common Patterns Across the Battery
| Condition | Audiogram and Speech | Immittance | OAE and ABR |
|---|---|---|---|
| Middle ear effusion | Mild-to-moderate conductive loss | Type B with normal ear canal volume; reflexes absent | OAEs absent; ABR latencies prolonged by the conductive loss |
| Tympanic membrane perforation or open tube | Mild conductive loss or normal hearing | Type B with a large ear canal volume | OAEs usually absent |
| Otosclerosis | Conductive loss, often a bone-conduction notch near 2000 Hz (Carhart notch) | Type A or As; reflexes absent | OAEs absent |
| Ossicular discontinuity | Conductive loss, possibly large | Type Ad; reflexes absent with the probe in the affected ear | OAEs absent |
| Cochlear loss (noise, presbycusis) | Sensorineural loss; word recognition consistent with the degree | Normal tympanogram; reflexes often present at reduced sensation levels | OAEs reduced or absent where hearing is impaired; ABR interpeak latencies normal |
| Retrocochlear lesion (for example, vestibular schwannoma) | Asymmetric sensorineural loss; word recognition poorer than expected; possible rollover | Elevated or absent reflexes with stimulation of the affected ear; possible reflex decay | OAEs may be present; ABR prolonged wave V or I-V interval or interaural wave V difference |
| Auditory neuropathy spectrum disorder | Any degree of loss; speech recognition, especially in noise, poorer than expected | Reflexes usually absent | OAEs and/or cochlear microphonic present; ABR absent or severely abnormal |
| Superior semicircular canal dehiscence | Low-frequency air-bone gap with very good bone conduction | Normal tympanogram; reflexes present | Large cVEMP or oVEMP amplitudes with low thresholds |
| Nonorganic hearing loss | SRT much better than the pure-tone average; inconsistent responses | Reflexes at levels near or below the admitted thresholds | Normal OAEs or ABR thresholds inconsistent with behavioral results |
Key integration rule: when an acoustic reflex is present at a level at or below the admitted behavioral threshold, the behavioral threshold cannot be accurate.
Integrating Vestibular Results
Combine the history with VNG, caloric, vHIT, rotary chair, VEMP, and posturography results. For example, a unilateral caloric weakness with reduced vHIT gain and corrective saccades on the same side indicates peripheral vestibular hypofunction on that side. Central signs, such as direction-changing gaze-evoked nystagmus or abnormal saccades and pursuit, call for neurologic referral.
Distinguishing Hearing, Tinnitus, and Sound Tolerance Problems
Patients often describe several problems at once, and the main problem determines management.
- Interview and questionnaires: the Tinnitus and Hearing Survey used in Progressive Tinnitus Management has separate sections for tinnitus, hearing, and sound tolerance problems, which helps show whether a "tinnitus" complaint is really a hearing problem (for example, "the tinnitus covers up speech").
- Tinnitus impact: questionnaires such as the Tinnitus Functional Index or Tinnitus Handicap Inventory, plus pitch and loudness matching.
- Sound tolerance: loudness discomfort levels and questionnaires, and an interview to separate hyperacusis (many everyday sounds are too loud), misophonia (strong emotional reactions to specific sounds), and phonophobia (fear of sound).
- If the main problem is hearing, amplification often comes first and may also reduce tinnitus awareness.
Developing Recommendations
Base recommendations on all findings plus the patient's goals and preferences:
- Medical referral: asymmetric or sudden sensorineural loss, conductive loss of unknown cause, ear drainage or pain, retrocochlear signs, vertigo with neurologic signs, or pulsatile tinnitus.
- Further testing: for example, ABR or imaging recommendations (the physician orders imaging), vestibular testing, or auditory processing evaluation.
- Intervention: hearing aids, cochlear implant evaluation, hearing assistive technology, aural rehabilitation, tinnitus management, or vestibular rehabilitation.
- Monitoring: for example, ototoxicity monitoring, progressive loss, or children with risk factors.
- Other referrals: speech-language pathology, early intervention, educational audiology, or mental health services.
Documentation and Reports
What a Diagnostic Report Should Include
- Identifying information, referral source, and reason for referral
- Relevant history and the patient's complaints
- Otoscopy results
- Tests performed, transducers, and reliability of responses
- Results (audiogram, tables) and a clear interpretation: type, degree, configuration, and site of lesion
- Specific, numbered recommendations
- Date, signature, and credentials
Writing Tips
- Lead with the answer to the referral question; physicians often read only the summary and recommendations.
- Avoid unexplained abbreviations in copies for patients and families, and use plain language for them.
- Many clinics use SOAP notes for follow-up visits: Subjective (what the patient reports), Objective (test results), Assessment (interpretation), and Plan (next steps).
- Complete documentation promptly and accurately; documentation supports billing and legal defensibility.
Sharing Results
- HIPAA allows sharing information with other providers for treatment without a separate authorization, but sending a report to a school, an employer, or a lawyer generally requires the patient's or parent's written authorization.
- Choose the right format for the recipient: a formal report or letter for a referring physician, a brief note for a follow-up, a secure patient portal or encrypted email, and a phone call for urgent findings (for example, a same-day call to otolaryngology for sudden sensorineural loss).
Communicating Results to Patients and Families
- Start by asking what the patient or family already understands and wants to know.
- Use plain language, show the audiogram (for example, with a speech-sound overlay), and explain what the results mean for daily life.
- Limit the amount of new information, especially after an unexpected diagnosis; families often remember little from an emotional first conversation. Give a written summary and schedule follow-up.
- Respond to emotions before giving more facts.
- Use teach-back to confirm understanding.
Working With Interpreters
- Use qualified medical or sign language interpreters; brief them before the session on the purpose of the visit and any technical terms.
- Speak directly to the patient in the first person ("How long have you noticed..."), not to the interpreter ("Ask her how long...").
- For a spoken-language interpreter, sit so that the patient can see you; for a sign language interpreter, position the interpreter near you so the patient can see both of you.
- Pause after short segments, avoid idioms, and document the interpreter's name or identification number.
A 35-year-old's admitted pure-tone thresholds are 60 dB HL in the right ear, yet ipsilateral acoustic reflexes are present at 65 dB HL and the SRT is 25 dB HL. What is the most appropriate interpretation?
The results confirm a moderate cochlear hearing loss with recruitment, so hearing aid fitting can proceed.
The results are inconsistent and suggest nonorganic loss; re-instruct and use objective threshold measures.
The results indicate a retrocochlear lesion, because reflexes should be absent with a 60-dB sensorineural loss.
The results show a conductive loss, because a large SRT and pure-tone discrepancy reflects a middle ear disorder.
A family physician refers a patient for a hearing evaluation and asks whether the patient needs an ENT referral. Which report approach best meets the physician's needs?
Provide raw test data without interpretation so that the physician can draw independent conclusions from it
Write a detailed narrative of every procedure and place the conclusions at the very end of a long report
Lead with a concise interpretation and a specific ENT referral recommendation, then the supporting results
Send the results only to the patient, because HIPAA prohibits sharing results with a referring physician
An audiologist is explaining diagnostic results to the Deaf parents of a newborn, using an American Sign Language interpreter. Which practice is most appropriate?
Address the interpreter directly with phrases such as "Tell them that..." so the interpreter knows what to sign
Ask the interpreter to simplify the medical content and decide which details the parents should hear
Give all of the diagnostic information quickly in one long explanation so the session stays short
Speak directly to the parents, seat the interpreter where they can see both of you, and pause often
Sections you finish are checked off in the contents.