What does the pronator drift test assess?

The pronator drift test specifically assesses the integrity of the corticospinal tract, which is a major pathway responsible for voluntary movement and motor control. This test helps evaluate for neurological deficits, particularly those that may arise from lesions in the corticospinal tract.

During the test, a patient is typically asked to hold their arms out in front of them with their palms facing upwards. If there is a weakness or a motor function disturbance on one side, the affected arm will begin to drift downwards or pronate, indicating potential damage in the corticospinal pathways that control movement. Therefore, the result of this test can help clinicians localize and identify issues related to motor function and neurological conditions affecting the brain or spinal cord.

While other choices focus on different aspects of neurological or physical assessments, like arm strength, cognitive function, or balance and coordination, the primary purpose of the pronator drift test is to specifically investigate the status and integrity of the corticospinal tract.