Final answer:
Deep tendon reflexes can aid in distinguishing between myasthenia gravis and Lambert-Eaton syndrome.
Step-by-step explanation:
Deep tendon reflexes can help differentiate between myasthenia gravis (MG) and Lambert-Eaton syndrome (LES). In MG, the deep tendon reflexes are typically normal or enhanced due to the compensatory effects of the autoimmune attack on the acetylcholine receptors at the neuromuscular junction. On the other hand, LES is associated with reduced or absent deep tendon reflexes, primarily due to antibodies targeting the voltage-gated calcium channels in the presynaptic terminals.