Allen's test is associated with: September 2012

Ans. D i.e. Radial aery Allen's test The hand is elevated and the patient/person is asked to make a fist-for about 30 seconds. Pressure is applied over the ulnar and the radial aeries so as to occlude both of them. Still elevated, the hand is then opened. It should appear blanched (pallor can be observed at the finger nails). Ulnar pressure is released and the colour should return in 7 seconds. Inference: Ulnar aery supply to the hand is sufficient and it is safe to cannulate/ prick the radial If color does not return or returns after 7-10 seconds, the test is considered positive and the ulnar aery supply to the hand is not sufficient. The radial aery therefore cannot be safely pricked/ cannulated.