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9. Results

There are two ways to consider the results of an Allen test. The first interpretation is that if color returns to the hand in five seconds, the result is negative -- the ulnar artery provides enough blood. If the color doesn’t return to the hand within five seconds, the test result is positive or abnormal. This means physicians may need an alternative cannulation or catheter insertion site. The other interpretation has three categories:

  • Return of blood flow in less than seven seconds is normal.
  • Blood flow that returns in eight to 14 seconds is equivocal.
  • Proper blood flow in more than 14 seconds is abnormal.

results Allen test kali9 / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.