A test of Allen negative in all its splendor.

A test of Allen negative in all its splendor.

The Allen Test, is part of the previous and mandatory procedure to perform a puncture of the radial artery.

Sustained pressure is exerted both on the radial and ulnar artery, the hand will become pale, after which we remove the fingers that press on the ulnar artery: it is positive when recovering the color of the hand in at least 7 seconds, doubtful 8-14 secs and negative (as in the picture)> to 15 seconds. This indicates a poor circulation provided by the ulnar artery, which in case of puncture of the radial rupture, would leave us without irrigation to the involved hand.

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