The role of bedside examination

When a patient reports a change in hearing, a formal audiological assessment is often the definitive step. However, in many clinical settings, a thorough bedside hearing testing examination is the first and most valuable tool. It helps the clinician distinguish conductive from sensorineural loss, detect asymmetry, and decide whether urgent referral is necessary. The bedside approach relies on simple acoustic stimuli: rubbed fingers, a tuning fork, and at times a ticking watch.

Preparing the patient and the environment

A reliable bedside hearing testing session requires as quiet an environment as possible. The examiner should position the patient comfortably, inspect the ear canals with an otoscope to ensure they are free of wax or foreign bodies, and explain the procedure. Testing begins by assessing each ear individually. The patient is asked to repeat words or numbers spoken softly, or to indicate when they hear a presented sound. Care is taken to avoid visual cues, so the examiner stands slightly behind the patient when testing each side.

Rubbed fingers as a screening tool

The light sound of rubbed fingers is a useful and convenient screening stimulus. The examiner rubs the thumb and index finger together close to the patient's ear, producing a soft high-frequency rustle. This sound is particularly sensitive to high-frequency hearing loss, which often accompanies age-related changes and noise damage. The examiner alternates between the left and right side while asking the patient to say whether they hear the sound and on which side. As a gross screening method, rubbed fingers help detect substantial asymmetries, though they do not provide a precise threshold. The test is performed with the fingers held still between trials to avoid giving the patient non-auditory cues.

Tuning fork examination principles

The tuning fork remains a foundational instrument in bedside hearing testing. A fork with a low frequency, typically 256 Hz or 512 Hz, is preferred because low frequencies provide better tactile feedback and are less affected by ambient noise. The examiner activates the fork by striking it gently against the palm or a soft surface, avoiding a harsh clang that would introduce unwanted overtones. Once set into vibration, the fork can be held near the ear for air conduction testing or pressed against the mastoid bone for bone conduction testing.

The Weber test

The Weber test is designed to evaluate lateralisation of sound. The examiner places the base of the vibrating tuning fork firmly on the midline of the skull, usually on the forehead or the vertex. The patient is asked whether the sound is heard in the centre, or more strongly in one ear. In a normal ear, the sound is perceived in the middle. In conductive hearing loss, the sound lateralises to the affected ear because ambient noise is blocked and the ossicular chain transmits less effectively, making the bone-conducted sound appear louder on the impaired side. In sensorineural hearing loss, the sound lateralises to the better-hearing ear. The Weber test therefore provides valuable information when interpreted together with the Rinne test.

The Rinne test

The Rinne test compares air conduction with bone conduction in a single ear. The examiner first places the vibrating tuning fork on the mastoid process behind the ear and asks the patient to signal when the sound is no longer heard. The fork is then quickly moved to a position near the ear canal, with the prongs aligned toward the opening. The patient is asked whether the sound is audible again. In normal hearing, air conduction is heard longer than bone conduction, so the tone is heard again when the fork is placed near the ear. This normal result is described as Rinne positive. In conductive hearing loss, bone conduction is perceived longer than air conduction, so the patient reports no sound when the fork is moved to the ear, a result termed Rinne negative. In severe sensorineural loss, both air and bone conduction are reduced, although the comparison may still appear positive; interpretation requires care and clinical context.

Ticking watch examination

A ticking watch is a classic bedside hearing testing tool, although its usefulness depends on the watch's acoustic characteristics. A mechanical watch with an audible tick produces a high-frequency sound suitable for detecting high-tone loss. The examiner holds the watch at a measured distance from the ear, gradually moving it closer until the patient first perceives the tick. A comparison is made between the two ears. This technique has largely been replaced by tuning forks and whispered speech in many practices, but it remains a simple demonstration of auditory awareness and can be helpful when other instruments are unavailable. The examiner must ensure the watch is not visible to the patient and that the room is sufficiently quiet for the tick to be detected.

Whispered speech testing

Although not listed among the core bedside tools, whispered speech is often combined with the other manoeuvres described above. The examiner stands at arm's length behind the patient to prevent lip reading, exhales fully, and then whispers a set of words or numbers. The patient is asked to repeat them. The opposite ear is tested in a similar manner, while the examiner masks the other ear by rubbing its tragus or by using a small noise generator. This method provides a functional measure of hearing for speech and complements the frequency-specific information obtained from tuning forks and rubbed fingers.

Interpreting the combined results

No single bedside test is sufficient on its own. A comprehensive bedside hearing testing assessment integrates the Weber and Rinne tests, responses to rubbed fingers, and, when available, the ticking watch. If the Weber lateralises to one ear and the Rinne test is negative on that same side, a conductive loss is likely. If the Weber lateralises to the better ear and the Rinne test is positive on the worse ear with a reduced duration, sensorineural loss is more probable. A sudden asymmetric hearing loss, particularly when accompanied by tinnitus, vertigo, or facial weakness, requires urgent referral for formal audiometry and further evaluation.

Limitations of bedside testing

Bedside hearing testing is a screening and topographical tool rather than a quantitative measurement. It cannot provide precise thresholds, speech discrimination scores, or a detailed audiogram. Ambient noise, poor technique, and a patient's subjective interpretation can all influence results. The tuning fork, rubbed fingers, and ticking watch are nevertheless invaluable in the acute setting, offering an immediate impression of the nature and lateralisation of hearing impairment. When findings are ambiguous or when a patient's history suggests significant ear disease, referral for formal audiological testing is always indicated.