You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Allen's test is associated with: September 2012 and explain in detail?
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.