Edited sentence: A result of between 3-5 seconds is equivocal, whereas the radial artery will not be considered for grafting if the result is longer than 5 seconds.A result of less than 3 seconds is considered as good and suitable.Allen's test is also performed prior to heart bypass surgery.Prior to heart bypass surgery, Allen's test is performed to assess the suitability of the radial artery to be used as a conduit.The radial artery is occasionally used as a conduit for bypass surgery, and its patency lasts longer in comparison to the saphenous veins