What is the purpose of the Allen Test?

The purpose of the Allen Test is specifically related to testing for Thoracic Outlet Syndrome. Thoracic Outlet Syndrome involves compression of neurovascular structures as they pass from the neck to the arm, potentially causing symptoms such as pain, numbness, and weakness in the upper limb. The Allen Test helps to evaluate the patency of the subclavian artery and assess blood flow, which can indicate the presence of vascular compression associated with this condition.

During the Allen Test, the patient is directed to open and close their hand to assess circulation while the examiner compresses both the radial and ulnar arteries. After releasing one artery while maintaining compression on the other, the speed at which blood returns to the hand is evaluated. A delayed return may suggest issues related to Thoracic Outlet Syndrome, such as vascular compression.

Understanding this context clarifies that while other tests may assess tendon injuries or evaluate range of motion, the Allen Test is distinctly designed to assess for circulatory issues related to Thoracic Outlet Syndrome.