Which test assesses compression by costoclavicular structures?

• A. Allan Test
• B. Costoclavicular Test
• C. Wright Test
• D. Halstead Maneuver

Answer: (B)

The costoclavicular space is the interval between the clavicle and the first rib where the lower brachial plexus and subclavian vessels can be compressed. The test that targets this region does so by depressing and retracting the shoulders to narrow that costoclavicular space while monitoring the radial pulse. A diminished pulse or reproduction of symptoms during this maneuver indicates compression in the costoclavicular structures, making this test the best choice for assessing that specific site. Other tests probe different outlet regions, such as the scalene triangle or the pectoralis minor space, so they don’t specifically isolate costoclavicular compression.