What is the Allen Test (Vascular) used for?

Assessing Arterial Blood Flow (Radial/Ulnar Artery Patency).

How do you perform the Allen Test (Vascular)?

Step 1: Patient makes a tight fist. Examiner occludes both radial and ulnar arteries.Step 2: Patient opens hand (palm is pale).Step 3: Release one artery and watch for color return. Repeat for the other artery.

What is a positive result for the Allen Test (Vascular)?

Normal: Hand flushes red within 3-5 seconds.Positive: Persistent pallor (>5s) indicates arterial occlusion.

What is the diagnostic accuracy of the Allen Test (Vascular)?

Sensitivity: 73%Specificity: 97%

Allen Test (Vascular) – Wrist & Hand Special Test

What is it used for?

Assessing Arterial Blood Flow (Radial/Ulnar Artery Patency).

How to Perform

Step 1: Patient makes a tight fist. Examiner occludes both radial and ulnar arteries.
Step 2: Patient opens hand (palm is pale).
Step 3: Release one artery and watch for color return. Repeat for the other artery.

Interpretation of Results

Normal: Hand flushes red within 3-5 seconds.
Positive: Persistent pallor (>5s) indicates arterial occlusion.

Diagnostic Accuracy

Sensitivity: 73%
Specificity: 97%

Clinical Context & Limitations

The Allen Test (Vascular) should be considered as one component of a comprehensive musculoskeletal assessment. No single special test has perfect diagnostic accuracy; thus, clinical decision-making should integrate test results with patient-reported symptoms, mechanism of injury, functional impairment, and relevant imaging.

Clinicians should be aware of potential false-positive results in patients with pain sensitisation, muscle guarding, or poor relaxation. For the Wrist & Hand region, combining the Allen Test (Vascular) with complementary examination tests significantly improves overall diagnostic confidence.