What is pronator drift?

Pronator drift refers to a neurological test used to detect weakness or motor impairment in the upper limbs. It involves asking a person to hold their arms outstretched in front of them with palms facing up and eyes closed. If one arm begins to drift downwards or pronate (rotate internally), it can indicate weakness or impairment in the contralateral hemisphere of the brain or corticospinal tract. Pronator drift is commonly used as a screening tool for stroke, multiple sclerosis, and other neurological conditions that can affect motor function. It is important to note that pronator drift is not specific to any one condition and must be interpreted in conjunction with other clinical findings and tests.