Adson's Test: A Thorough Guide to the Adson Test for Thoracic Outlet Syndrome

The Adson Test—also written as Adson’s Test in some contexts—remains a foundational examination technique in the assessment of thoracic outlet syndrome (TOS). This article provides a comprehensive, evidence‑based overview of the Adson Test, including its history, technique, interpretation, limitations, and how it fits into a broader clinical assessment. Whether you are a student, a clinician in training, or an experienced practitioner seeking to refresh your approach, this guide explains how to perform the Adson Test correctly, what a positive result implies, and how to use the information alongside other tests to support an accurate diagnosis.

What is the Adson Test and why is it used?

The Adson Test is a provocative manoeuvre designed to assess arterial compromise at the thoracic outlet, typically caused by compression of the subclavian artery by the anterior scalene muscle or other structures near the thoracic outlet. In practical terms, the test helps identify dynamic changes in the radial pulse when the arm is placed in a specific position with the patient taking a deep breath and turning the head toward the tested side. A noticeable diminishment or disappearance of the radial pulse during the manoeuvre can indicate vascular compression consistent with thoracic outlet syndrome, especially when combined with clinical symptoms such as arm numbness, colour changes, or fatigue.

While the Adson Test is widely taught and used, it is not perfectly specific or sensitive on its own. It is best interpreted as part of a comprehensive clinical assessment that includes patient history, symptom patterns, physical examination findings, and, when appropriate, imaging and specialised tests. In some variants, clinicians may refer to the “Adson’s manoeuvre” or simply “Adson’s test” depending on regional terminology.

Historical background and evolution

The Adson Test originated in the early to mid‑20th century as part of a suite of provocative tests developed to evaluate nerve and vascular structures in the neck and shoulder region. Named after a clinician who popularised the technique, the test has endured because of its straightforward execution and its ability to provoke symptoms in a controlled manner. Over the decades, variations have emerged, including adjustments in head rotation, depth of inspiration, and arm positioning, each with the aim of enhancing reliability or targeting different compartments around the thoracic outlet. Today, clinicians commonly combine Adson’s Test with other assessments such as Wright’s Test and Roos’ Test to obtain a more nuanced picture of the patient’s condition.

Indications and limitations

Indications for performing the Adson Test typically include patients presenting with signs and symptoms that suggest thoracic outlet syndrome, such as:

Arm claudication or fatigue with activities involving arm elevation
Paresthesias or numbness in the hand or forearm
Colour changes (pallor or erythema) of the hand on exertion
Weak or absent radial pulse on the affected side during the manoeuvre

Limitations to keep in mind include:

Variable baseline pulse and arterial states among individuals, which can affect interpretation
Potential for false negatives if the pathophysiology is intermittent or affected by factors not reproduced during the test
Possible false positives due to examiner technique, patient anxiety, or concurrent vascular abnormalities
Limited ability to localise the exact structure causing compression solely from the Adson Test

Therefore, the Adson Test is most informative when used as part of a comprehensive clinical assessment, rather than as a stand‑alone diagnostic tool.

Step‑by‑step: How to perform the Adson Test correctly

Preparation and positioning

Before you begin, ensure the patient is comfortable and explain the procedure clearly. Perform the test in a quiet environment to avoid distractions that could influence the patient’s breathing or pulse assessment. The clinician should:

Have the patient sit or stand with the tested arm resting by the side and the elbow slightly flexed.
Palpate the radial pulse of the tested limb with the index finger and thumb to establish a baseline pulse.
Explain that the patient will be asked to take a deep breath, hold it momentarily, and then turn the head toward the tested side while the arm is extended and marginally externally rotated.

Technique and sequence

The Adson Test is performed with the following sequence. While different training manuals may present small variations, the core method remains consistent:

The clinician extends the patient’s arm forward slightly and externally rotates the shoulder while maintaining the elbow in near full extension.
The patient is instructed to take a deep breath in and hold it (a maximal inspiratory effort is often recommended for consistency).
With the patient’s head turned toward the tested side, the clinician gently extends the neck and instructs the patient to look toward the ipsilateral armpit. This position places the scalenes and surrounding structures in a configuration that can provoke compression at the thoracic outlet.
Simultaneously or just after the breath hold, palpate the radial pulse again to determine whether it diminishes, becomes weaker, or disappears entirely.

Interpretation of results

Interpretation hinges on the comparison of the radial pulse before the manoeuvre and during the provocative position. A positive Adson Test result typically includes one or more of the following findings:

A notable reduction or loss of the radial pulse on the tested side during the manoeuvre
Reproduction or aggravation of patient‑reported symptoms such as numbness, tingling, or discomfort in the arm or hand
A consistent, reproducible response when the test is repeated in the same manner

However, a positive pulse alteration should be correlated with the patient’s symptoms and other clinical findings. Some individuals may have a diminished pulse without symptoms, or conversely, experience symptoms without a clear pulse change. In such cases, further evaluation with imaging or additional physical tests is warranted.

Common variations of the Adson Test and related maneuvers

To gain a broader understanding of thoracic outlet dynamics, clinicians often perform complementary provocative tests. These tests can provide additional information about the site and mechanism of compression and help differentiate vascular from neurogenic TOS.

Wright’s (Hyperabduction) Test

The Wright’s Test assesses compression as the arm is elevated above the head and placed behind the head, which places stress on the costoclavicular space and the pectoralis minor. A positive result is suspected when the radial pulse diminishes with abduction and external rotation of the arm.

Roos’ (Elevated Arm) Test

Roos’ Test involves rapidly opening and closing the hands with the arms held in a 90‑degree abduction and external rotation position. Reproduction of symptoms or arm fatigue is considered a positive result for TOS, though this test is more qualitative and can be uncomfortable for patients.

Military Pinch Test and Scalene Anticus Maneuvers

These variants focus on the involvement of specific scalene muscles and adjacent tissues. While not as commonly used as Adson’s Test, they can contribute to a fuller understanding when interpreted by an experienced clinician.

Reliability, validity, and the evidence base

The Adson Test has long been part of clinical teaching, but its diagnostic accuracy varies across studies and patient populations. Key considerations include:

Varied sensitivity and specificity depending on the exact technique used and the patient population examined
Operator dependency—differences in how the head position, inspiration level, and arm alignment are executed can influence results
Interobserver variability among clinicians assessing pulse changes and symptom reproduction

Because of these factors, contemporary practice emphasises a multimodal approach. The Adson Test should be interpreted alongside other provocative tests, patient history, and, when indicated, imaging modalities such as duplex ultrasonography, computed tomography angiography, or magnetic resonance angiography. In many cases, a comprehensive assessment will better clarify whether a patient has TOS and what treatment pathway is most appropriate.

Practical tips for clinicians and students

Whether you are teaching the Adson’s Test or refining your own technique, these practical points can help maximise reliability and patient comfort:

Standardise your technique as much as possible within your clinical setting to reduce variability between assessments.
Ensure the patient’s posture is relaxed prior to starting; tension in the neck or shoulder girdle can artificially influence the pulse.
Use gentle, controlled movements rather than forceful manipulation to avoid unnecessary discomfort or injury.
Document both the baseline pulse and the provocative response, including whether symptoms were reproduced and the time course of any pulse change.
Consider repeating the test on both sides in a controlled manner to compare findings, noting any asymmetry.
Involve the patient in the process by explaining what you are assessing and how you will interpret the results.

Common pitfalls and how to avoid them

Several pitfalls can affect the accuracy of the Adson Test. Awareness of these can improve reliability:

Inadequate inspiratory effort can reduce the likelihood of vascular compression being reproduced; ensure a consistent deep breath is taken.
Incorrect head rotation or neck extension may either exaggerate or diminish findings; follow the standard alignment and avoid compensatory movements.
Pulse palpation should be performed by the examiner with a calm, deliberate touch; frantic palpation can lead to misinterpretation.
External factors such as cold environmental conditions or recent caffeine intake can affect vascular tone and should be considered when interpreting results.

Adson’s Test in different populations

The prevalence and presentation of thoracic outlet syndrome differ across populations. For example, athletes may report exertional symptoms related to repetitive overhead motions or intense shoulder girdle engagement. In postural or traumatic cases, structural changes can alter the thoracic outlet geometry long after an acute event. When applying the Adson Test in diverse groups, clinicians should:

Be mindful of baseline physiologic differences in pulse quality and vascular response
Adjust expectations regarding amplitude of pulse changes and symptom reproduction
Correlate test outcomes with functional limitation and daily activities to determine clinical relevance

Safety, ethical considerations, and patient communication

Provocative tests carry a low risk profile when performed correctly, but clinicians should exercise care. Practical considerations include:

Obtain informed consent by explaining the purpose of the test and what the patient may experience
Stop the manoeuvre immediately if the patient reports significant pain, dizziness, or neurological symptoms beyond mild discomfort
Avoid applying excessive force or causing muscle strain—techniques should be measured and controlled
Respect patient comfort, particularly in those with known cervical spine issues or shoulder instability

Interpreting the Adson Test alongside other assessments

In many cases, a positive Adson Test alone is insufficient to establish a diagnosis of thoracic outlet syndrome. Clinicians commonly integrate:

History of symptoms, including onset, duration, timing (reproducibility with activity), and distribution
Other provocative maneuvers (Wright’s Test, Roos’ Test) to localise the site of compression
Physical examination findings such as posture, shoulder girdle strength, and nerve tension signs
Imaging studies to evaluate anatomical structures, vasculature, and dynamic compression

Ultimately, the Adson Test is a valuable piece of the diagnostic puzzle, particularly when used in conjunction with a systematic assessment strategy and thoughtful clinical reasoning.

Adson Test versus other diagnostic approaches

In modern practice, the Adson Test is typically one part of a broader diagnostic framework for TOS. It differs from purely imaging-based approaches in that it assesses dynamic vascular response in real time, during a provocative posture. Imaging modalities, by contrast, offer structural and anatomical information—such as the presence of a cervical rib or anomalous muscular bands—that can corroborate physical findings. A balanced approach often yields the most accurate diagnosis and informs treatment planning, whether conservative management, physical therapy, or surgical consideration is appropriate.

Case examples: applying the Adson Test in clinical scenarios

Case narratives help illustrate how the Adson Test fits into real‑world practice. Consider these representative situations:

Case A: a young athlete with exertional arm symptoms

A collegiate swimmer presents with numbness in the hand after overhead strokes. The Adson Test is performed with the head turned toward the tested side and the arm extended. A transient decrease in the radial pulse is noted along with symptoms reported by the patient during the maneuver. The clinician proceeds with Wright’s Test and Roos’ Test, and imaging confirms no major vascular abnormality but mild scalene muscle tightness. A targeted physical therapy plan is implemented, focusing on scalene stretching and posture correction, with follow‑up assessments showing improvement in symptoms.

Case B: post‑traumatic shoulder girdle with intermittent symptoms

After a shoulder injury, a patient experiences occasional arm fatigue and colour change during daily activities. The Adson Test yields a variable pulse response, dependent on the position and breath. Combined with Roos’ Test and duplex ultrasonography, the assessment suggests positional compression rather than fixed vascular stenosis. Treatment emphasises posture rehabilitation, scar tissue management, and progressive loading, with monitoring for symptom recurrence during activity.

Bottom line: the Adson Test in contemporary clinical practice

The Adson Test remains a useful, teachable clinical tool when applied with care, consistency, and an understanding of its limitations. It offers a dynamic glimpse into how the thoracic outlet behaves under provocative positioning and inspiratory effort. For best results, clinicians should use the Adson Test as part of a comprehensive evaluation, combining patient history, additional provocative maneuvers, and appropriate imaging studies when indicated. With thoughtful application, the Adson Test contributes meaningful data that helps clinicians differentiate neurogenic, vascular, and combined forms of thoracic outlet syndrome and guides effective management strategies.

Glossary of terms and quick reference

To support quick recall, here is a concise reference of key terms related to the Adson Test and thoracic outlet syndrome:

Adson’s Test (Adson Test, Adson’s manoeuvre): A provocative manoeuvre used to assess arterial compression at the thoracic outlet by the scalene muscles.
Thoracic outlet syndrome (TOS): A constellation of signs and symptoms resulting from compression of neurovascular structures between the thorax and shoulder girdle.
Positional compression: Vascular or neural compression that occurs only when the arm or neck is placed in a specific position.
Provocative maneuvers: Tests designed to reproduce symptoms by placing the body in positions that provoke compression or nerve irritation.

Adson’s Test: A Thorough Guide to the Adson Test for Thoracic Outlet Syndrome