During the general approach to deep tendon reflex testing, what should the patient do to prepare?

• A. Contract
• B. Relax
• C. Hold breath
• D. Sit upright

Answer: (B)

Relaxation is essential. Deep tendon reflex testing relies on the muscle being at rest so that a quick, passive stretch from the hammer taps the muscle spindles and produces a consistent reflex. If the patient actively tenses or contracts the muscle, the reflex can be blunted or exaggerated, making the result unreliable. Holding the breath or bearing down can alter intrathoracic pressure and overall reflex responses, also skewing results. A comfortable, supported position helps the limb stay relaxed, though the exact posture is less important than ensuring the muscle is not consciously contracted.