In caloric testing, an interaural asymmetry of 12% is considered:

In caloric testing, an interaural asymmetry of 12% is considered:

• A. Significant unilateral weakness
• B. Significant bilateral weakness
• C. Normal caloric response
• D. Directionality imbalance

Answer: (C)

Interaural asymmetry looks at how similar the caloric responses are between the two ears. Some difference is normal because of small anatomical and testing variability, so not every difference means a problem. In practice, a unilateral weakness becomes evident when this asymmetry is about 20–25% or greater, depending on the lab's criteria. A 12% difference is below that threshold, so it’s interpreted as within normal limits. There’s no unilateral loss and no directional imbalance indicated by this level of asymmetry. If the asymmetry were larger, clinicians would compute specific indices to quantify unilateral weakness and check for any directional preponderance.

Interaural asymmetry looks at how similar the caloric responses are between the two ears. Some difference is normal because of small anatomical and testing variability, so not every difference means a problem. In practice, a unilateral weakness becomes evident when this asymmetry is about 20–25% or greater, depending on the lab's criteria. A 12% difference is below that threshold, so it’s interpreted as within normal limits. There’s no unilateral loss and no directional imbalance indicated by this level of asymmetry. If the asymmetry were larger, clinicians would compute specific indices to quantify unilateral weakness and check for any directional preponderance.