Which tool is used to test tendon reflexes?

• A. Tuning fork
• B. Stethoscope
• C. Percussion hammer
• D. Thermometer

Answer: (C)

Testing tendon reflexes relies on delivering a brief, precise tap to a tendon to trigger the reflex arc. The instrument designed for that purpose is a reflex hammer (percussion hammer). Its soft, controlled strike to a tendon like the patellar tendon at the knee produces a quick stretch that elicits the deep tendon reflex, allowing the clinician to assess the integrity of the neural pathways involved.

Stethoscope is used for listening to sounds in the heart, lungs, or intestines. A tuning fork primarily tests vibratory sensation or hearing, not reflexes. A thermometer measures temperature. So, the reflex hammer is the tool that best fits the goal of testing tendon reflexes.