MSFinals-2955

A 48-year-old woman visits her doctor with complaints of painful tingling over the lateral side of her left hand upon awakening in recent weeks. She also reports experiencing clumsiness in her hand. Upon examination, the doctor notes reduced sensation on the palmar aspects of her left thumb, index, and middle and ring fingers, leading to a suspicion of carpal tunnel syndrome. What clinical examination would be most effective in confirming this diagnosis?