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8. Procedures

All variations of the Allen test are effective for examining blood flow before medical procedures. For example, if doctors need to insert a cannula or catheter into the radial artery, they need to ensure the ulnar artery can provide enough blood during the surgery. Physicians often perform the modified Allen test before heart bypass surgery; the Allen test can determine the suitability of the radial artery as a conduit and ensures the hand will not suffer from a loss of blood flow.

Allen test procedures bmcent1 / 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.