What is the Roos Stress Test?
The Roos Stress Test, also called the Elevated Arm Stress Test or East Test, is a physical examination used for diagnosing thoracic outlet syndrome (TOS). This test helps evaluate symptoms that occur when there is compression in the thoracic outlet, where the nerves and blood vessels pass between the collarbone and the first rib. During the test, the patient raises their arms, externally rotates them, flexes their elbows to 90 degrees, and repeatedly opens and closes their hands for about three minutes.
Thoracic outlet syndrome occurs when there is compression of the nerves or blood vessels in the space between the collarbone and the first rib (Lee et al., 2010). There are several types of TOS, including neurogenic thoracic outlet syndrome (caused by nerve compression), venous thoracic outlet syndrome (caused by compression of veins), and arterial TOS (caused by artery compression). This compression can cause symptoms such as pain in the neck, shoulder, and arms, as well as numbness, weakness, and swelling in the affected limb. Other conditions, such as complex regional pain syndrome, can have overlapping symptoms with TOS.
The Roos Stress Test is often performed when a patient presents with unexplained neck pain, numbness, or symptoms suggestive of brachial plexus or blood vessel compression. Due to its ability to recreate symptoms in patients with thoracic outlet compression syndrome, it serves as a valuable screening tool when combined with other provocative tests, enhancing diagnostic accuracy (Brantigan and Roos, 2004).










