Allen Test

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Allen Test

Test for adequate circulation of the arteries of the hand

First the radial and ulnar arteries need to be palpated. Then, both arteries are blocked by the examiner applying sufficient pressure while the patient makes a fist. This forces all of the blood out of the hand.

Next, the patient relaxes their fist and one of the arteries is released. The hand should quickly refill with blood and return to a normal color.

This procedure is then repeated with the other artery.

Test is considered to be positive  if one or both of the arteries does not return normal color to the entire hand

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