Which statement best describes the protocol for deep tendon reflex testing?

Which statement best describes the protocol for deep tendon reflex testing?

• A. With the muscle relaxed and limb supported, a reflex hammer delivers a brisk strike to the tendon while observing muscle contraction and joint movement bilaterally.
• B. The examiner taps the tendon after asking the patient to plantarflex.
• C. The patient performs a deep breath before testing.
• D. The reflex is elicited by tapping the bone next to the tendon while the limb is unsupported.

Answer: (A)

Deep tendon reflex testing relies on a quick, tendon-focused stimulus to elicit a brief muscle contraction while the muscle is relaxed and the limb is supported. This setup ensures the reflex arc is unobstructed by voluntary effort or gravity, allowing a clear, measurable response. Striking the tendon with a reflex hammer activates the muscle spindle receptors, producing a brisk stretch that triggers the contraction. Observing the contraction—and the associated joint movement—in both limbs helps gauge neural pathway integrity and symmetry. The other approaches fail to follow this setup. Plantarflexing before tapping can alter baseline muscle tone and change the reflex response. Asking for a deep breath doesn’t affect the reflex pathway being tested. Tapping the bone next to the tendon with an unsupported limb doesn’t engage the correct tendon or maintain a relaxed state, leading to unreliable results.

Deep tendon reflex testing relies on a quick, tendon-focused stimulus to elicit a brief muscle contraction while the muscle is relaxed and the limb is supported. This setup ensures the reflex arc is unobstructed by voluntary effort or gravity, allowing a clear, measurable response. Striking the tendon with a reflex hammer activates the muscle spindle receptors, producing a brisk stretch that triggers the contraction. Observing the contraction—and the associated joint movement—in both limbs helps gauge neural pathway integrity and symmetry.

The other approaches fail to follow this setup. Plantarflexing before tapping can alter baseline muscle tone and change the reflex response. Asking for a deep breath doesn’t affect the reflex pathway being tested. Tapping the bone next to the tendon with an unsupported limb doesn’t engage the correct tendon or maintain a relaxed state, leading to unreliable results.