What does the Costoclavicular Syndrome Test primarily assess for?

The Costoclavicular Syndrome Test primarily assesses for compression of the subclavian artery, a condition that can arise in the context of thoracic outlet syndrome. This syndrome is characterized by the compression of blood vessels and nerves in the space between the collarbone and first rib.

During this test, the patient's arms are placed in a specific position, often involving the shoulder being drawn down and back. This position aims to simulate the anatomical and mechanical conditions that can lead to the compression of the subclavian artery as it traverses beneath the clavicle. A positive test is indicated by the reproduction of symptoms such as numbness or tingling in the upper extremity, signifying possible vascular compromise due to the compression.

Understanding the specific mechanism of the Costoclavicular Syndrome Test is essential for differential diagnosis in patients presenting with vascular or neurological symptoms in the upper limb, as it guides clinicians in determining appropriate interventions and management strategies.