Adson’s maneuver is a physical examination test used to detect compression of the subclavian artery at the thoracic outlet, the narrow passageway between the collarbone and first rib where major blood vessels and nerves travel from the chest into the arm. The test picks up a high proportion of true cases when vascular compression is present, with sensitivity reported between 72% and 92%, but it also flags a substantial number of people who don’t actually have the condition, with specificity as low as 9% in some studies.1PubMed Central. Diagnostic Accuracy and Clinical Utility of Adson’s Test in Detecting Subclavian Artery Compression Associated With Cervical Ribs: A Systematic Review That mismatch between catching real problems and producing false alarms is the central tension of this test and the reason clinicians rarely rely on it alone.
How the Test Is Performed
The procedure itself is straightforward and takes less than a minute. You sit upright while the examiner locates your radial pulse at the wrist. You then extend your neck (tilt your head back), rotate your head toward the side being tested, and take a deep breath and hold it. The examiner monitors your radial pulse throughout. If the pulse weakens or disappears, or if the position reproduces your symptoms (pain, tingling, or numbness radiating into the arm or hand), the test is considered positive.2Judi Clinical Journal. Provocative Tests in Diagnosis of Thoracic Outlet Syndrome: A Narrative Review The idea is that turning the head and extending the neck tightens the scalene muscles in the neck, which can pinch the subclavian artery against the first rib if you have an anatomical predisposition to compression at that site.
A variation sometimes called Adson B (or the reverse Adson test) has you turn your head away from the affected side instead. This version targets compression from a slightly different angle, and research suggests it has a somewhat higher false-positive rate than the classic version, around 20% in healthy subjects compared to roughly 9% for the standard test.3PubMed. False positive rate of thoracic outlet syndrome diagnostic maneuvers
Why the False-Positive Rate Matters
The biggest problem with Adson’s maneuver is that plenty of people without thoracic outlet syndrome still test positive. In a study of asymptomatic, healthy subjects, about one in eight showed a vascular response (a diminished radial pulse) during the Adson maneuver.4PubMed. Thoracic outlet syndrome: provocative examination maneuvers in a typical population Another study found that roughly 11% of healthy individuals had an altered pulse during the classic Adson test, and 11% experienced paresthesias (tingling or numbness).5PubMed. The false-positive rate of thoracic outlet syndrome shoulder maneuvers in healthy subjects The reason is largely anatomical variation: many people have slightly narrow thoracic outlets or scalene muscles that happen to compress the artery a bit when the head is turned, without ever producing symptoms in daily life.
The false-positive rate climbs even higher in people who have other nerve-compression conditions. Patients with carpal tunnel syndrome, for example, are especially prone to testing positive on Adson’s maneuver even when their thoracic outlet is perfectly normal.6PubMed. False positive rate of thoracic outlet syndrome diagnostic maneuvers This overlap is a headache for clinicians because someone presenting with arm pain, tingling, and numbness could have carpal tunnel, cervical radiculopathy, or thoracic outlet syndrome, and a positive Adson test does not reliably distinguish among them.
Where the test becomes more useful is in a narrower clinical context. One systematic review found that predictive value improved meaningfully when testing patients who already had cervical ribs (an extra rib arising from the lowest cervical vertebra, present in roughly 0.5 to 1% of the population) or when Adson’s was combined with other provocative maneuvers rather than used in isolation.7PubMed Central. Diagnostic Accuracy and Clinical Utility of Adson’s Test in Detecting Subclavian Artery Compression Associated With Cervical Ribs: A Systematic Review In other words, the test works best as a clue stacked alongside other clues, not as a standalone verdict.
Adson’s Versus Other Provocative Tests
Adson’s maneuver is just one member of a family of bedside tests for thoracic outlet syndrome. Each puts the shoulder, arm, or neck in a different position to provoke compression at a slightly different anatomical bottleneck. How they compare matters because clinicians often run several in sequence.
The Roos test (also called the elevated arm stress test, or EAST) is the most commonly used alternative. You hold both arms overhead with elbows bent at 90 degrees and repeatedly open and close your hands for three minutes. If pain, tingling, or vascular changes appear, it is considered positive. The Roos test has estimated sensitivity around 84%, which is comparable to Adson’s, but its specificity is low (around 30%), and its false-positive rate in healthy people is considerably higher. One study found that 62% of asymptomatic subjects had an altered pulse during the EAST, and 47% of normal subjects tested positive on the Roos test in a separate study.8PubMed. The false-positive rate of thoracic outlet syndrome shoulder maneuvers in healthy subjects9PubMed. False positive rate of thoracic outlet syndrome diagnostic maneuvers The Roos test is considered more useful for neurogenic thoracic outlet syndrome (the nerve-based type) because it stresses the brachial plexus rather than just the artery, but the tradeoff is that almost half of healthy people will test positive.
The costoclavicular maneuver (sometimes called the military brace test) involves pulling the shoulders back and down, compressing the space between the collarbone and first rib. This test showed vascular responses in 47% of asymptomatic limbs in one study, making it even less specific than Adson’s.10PubMed. Thoracic outlet syndrome: provocative examination maneuvers in a typical population The hyperabduction maneuver (Wright’s test), where the arm is lifted overhead, had the highest false-positive rate of all, with vascular responses in 57% of healthy limbs.
One narrative review reported that Adson’s test, when studied by Gillard and colleagues in 2001, achieved a positive predictive value of 85%, sensitivity of 79%, and specificity of 76%, placing it among the better-performing provocative tests for TOS overall.11Judi Clinical Journal. Provocative Tests in Diagnosis of Thoracic Outlet Syndrome: A Narrative Review Those numbers are notably more optimistic than what the broader systematic review reported, which highlights a recurring theme in this area: study results vary widely depending on the patient population tested, how “positive” is defined, and whether the examiners are assessing pulse changes, symptom reproduction, or both.
In practice, most clinicians treat a single positive provocative test with skepticism and look for consistency across multiple maneuvers plus the patient’s symptom pattern. When more than half of healthy people can trigger a positive result on at least one of these tests, as one study found, no single bedside maneuver can carry the diagnostic weight on its own.12PubMed. False positive rate of thoracic outlet syndrome diagnostic maneuvers
Vascular Versus Neurogenic Thoracic Outlet Syndrome
Thoracic outlet syndrome is not one disease but a family of related conditions, and which type you have changes how much weight Adson’s maneuver deserves. The three main types are arterial (aTOS), venous (vTOS), and neurogenic (nTOS). Arterial TOS involves compression of the subclavian artery, venous TOS involves compression of the subclavian vein, and neurogenic TOS involves compression of the brachial plexus nerves. Neurogenic accounts for the vast majority of cases, roughly 95% or more, while vascular types are comparatively rare.
Adson’s maneuver was designed to detect arterial compression, and that is where it performs best. The test’s whole logic relies on detecting changes to the arterial pulse. But when you’re dealing with neurogenic TOS, the test becomes far less reliable. A review of studies on nTOS patients found that positive rates on Adson’s test ranged from as low as 22% to as high as 100%, with a median of only 31%.13Judi Clinical Journal. Provocative Tests in Diagnosis of Thoracic Outlet Syndrome: A Narrative Review The fundamental issue is that many patients with nerve compression at the thoracic outlet have no vascular compromise whatsoever, so a test that monitors the radial pulse will miss them entirely. For nTOS, the Roos test is generally preferred because it provokes neurogenic symptoms directly.
A study of construction workers offers a vivid illustration of this split. Among workers screened for TOS, 90% tested positive on the Roos test (indicating neurogenic involvement), while only 10% tested positive on Adson’s (indicating vascular involvement), and just 5% tested positive on both.14International Journal of Research and Review. Prevalence of Neurogenic and Vascular Thoracic Outlet Syndrome Among Construction Site Worker Using ROOS and Adson Test The two tests are essentially fishing in different ponds, and choosing the right one depends on what you suspect is being compressed.
What Happens After a Positive Test
A positive Adson maneuver is not a diagnosis. It is the beginning of a diagnostic workup, not the end of one. When a clinician gets a positive result and the clinical picture is consistent with TOS, the next step usually involves imaging.
Duplex ultrasound with dynamic positioning is one of the more accessible tools. The examiner places a probe over the subclavian artery or vein and then has you move through provocative positions while watching the vessel in real time. This approach can directly visualize compression as it happens, including measurable changes in artery diameter and blood flow speed.15PubMed. Helical CT angiography of thoracic outlet syndrome: functional anatomy CT angiography with postural maneuvers takes this a step further, providing detailed anatomical images of the costoclavicular space in both neutral and stressed positions. One study of 79 symptomatic patients found significant narrowing of the costoclavicular space after postural maneuvers compared to the neutral position, confirming what the bedside test suggested but with anatomical precision.
MRI and magnetic resonance angiography can also be valuable, especially for neurogenic cases where the concern is nerve rather than artery compression. Nerve conduction studies sometimes play a role as well, though their sensitivity for nTOS is limited and results are often normal even in confirmed cases. The point is that provocative maneuvers like Adson’s serve as a screening gate. They help a clinician decide whether to pursue imaging and further workup, but they don’t replace those steps.
Conditions That Mimic Thoracic Outlet Syndrome
Part of the reason Adson’s test has a high false-positive rate is that several common conditions produce symptoms nearly identical to TOS, and some of them can even cause changes in the radial pulse or nerve sensitivity during provocative positioning.
Cervical radiculopathy, caused by a pinched nerve root in the neck (often from a herniated disc or bone spur), is one of the closest mimics. Both conditions can cause pain and tingling radiating into the arm and hand. A useful clinical distinction is that raising the arm overhead typically relieves cervical radiculopathy symptoms but makes TOS symptoms worse.16Barw Medical Journal. Differential Diagnosis of Neurogenic Thoracic Outlet Syndrome: A Review The Spurling test, where the examiner extends and tilts the neck while pressing down on the head, is the go-to bedside test for cervical radiculopathy and can help separate the two.
Carpal tunnel syndrome is another frequent confounder. Both conditions cause hand numbness and tingling, but carpal tunnel tends to produce pain below the elbow and spare the shoulder and neck, while nTOS symptoms typically start higher, at the neck or shoulder, and radiate down. Carpal tunnel involves compression of the median nerve at the wrist, whereas TOS involves structures at the base of the neck and upper chest. A positive Tinel’s sign over the wrist points toward carpal tunnel, while Tinel’s over the brachial plexus or ulnar nerve higher in the arm suggests TOS.17Barw Medical Journal. Differential Diagnosis of Neurogenic Thoracic Outlet Syndrome: A Review Complicating matters, some patients have both conditions simultaneously (so-called “double crush” scenarios), which can make each individual test harder to interpret.
Other conditions on the differential include Raynaud’s phenomenon (where blood vessels in the fingers overreact to cold or stress), rotator cuff injury, and even cardiac issues when left-sided arm symptoms are involved. This crowded differential diagnosis is another reason a single provocative maneuver cannot carry the diagnostic burden alone.
When Surgery Follows and How the Maneuver Tracks Recovery
For patients who fail conservative management (physical therapy targeting posture, scalene stretching, and nerve-gliding exercises), surgical decompression of the thoracic outlet is sometimes necessary. This typically involves removing the first rib, a cervical rib if one is present, or releasing the scalene muscles. One study of pediatric and young adult patients found substantial improvements in provocative maneuver results after surgery, meaning the previously positive Adson’s or Roos tests normalized as the compression was relieved.18PubMed. Thoracic Outlet Syndrome in the Pediatric and Young Adult Population
This use of provocative maneuvers as a tracking tool rather than a diagnostic one is where they arguably earn the most clinical value. When Adson’s test is positive before an intervention and negative afterward, it provides a tangible, repeatable measure of whether the compression has been resolved. In this role, the test’s poor specificity matters less because you are comparing the same patient against themselves, not trying to decide whether a new patient has TOS in the first place.
Practical Points If You Are Being Tested
If a clinician performs Adson’s maneuver during your exam, a few things are worth keeping in mind. First, a positive result does not mean you have thoracic outlet syndrome. Given how common false positives are, especially if you also have carpal tunnel or other nerve issues, it is a reason for further investigation, not a reason for alarm. Second, a negative result when you have arm and hand symptoms does not rule TOS out, particularly if the concern is neurogenic rather than vascular. The test was designed around arterial compression and simply misses many nerve-only cases.
Third, the examiner’s technique matters. How firmly they palpate the radial pulse, how long you hold the position, and whether they assess symptom reproduction in addition to pulse changes can all affect the result. There is no universally standardized protocol, which partly explains why sensitivity and specificity numbers vary so much across studies. If your symptoms are convincing but provocative tests are inconclusive, pushing for imaging is reasonable.
Finally, if you work in a physically demanding job or a repetitive overhead-reaching role, be aware that TOS symptoms can develop gradually and be mistaken for simple muscle strain or overuse injury. The construction-worker study mentioned earlier illustrates how common subclinical thoracic outlet compression may be in occupational settings, even among people who have not sought medical attention. Persistent arm heaviness, hand numbness, or a sense that your arm “falls asleep” easily during overhead tasks is worth mentioning to your doctor, even if it seems minor.