The patient is in the sitting position for the Allen test.What is the technique of the Allen Test for Blood Flow? This Allen test is also used to determine which artery provides the major blood supply to the hand.This Allen Test is used to determine the patency of the radial & ulnar arteries.What is the purpose of the Allen Test for Blood Flow? Since the radial & ulnar arteries both form the anastomosis means the deep & superficial palmar arch which is the blood supply of the hand is ensured to one of the arteries is occluded.The superficial palmar branch forms the superficial palmar arch, while the deep branch contributes to the deep palmar arch.The ulnar artery is lies under the flexor carpi ulnaris of the forearm & at the wrist joint enters the Guyon’s canal, where it is split into a deep palmar branch & a superficial palmar branch.The other branch of the radial artery is crossed dorsally to deep into the tendons of the anatomic snuffbox to form the deep palmar arch.The radial artery runs between the brachioradialis & flexor carpi radialis muscles of the forearm & at the wrist joint splits into a superficial branch for to contribute to the superficial palmar arch.The hand is a complex & rich vascular network, which is most of the supplied by the radial & ulnar arteries.Diagnostic Values & Interpretation of the Allen Test for Blood Flow:.What is the technique of the Allen Test for Blood Flow?.What is the purpose of the Allen Test for Blood Flow?.Clinically Relevant Anatomy of the hand:.In thoracic outlet syndrome = TOS & specifically vascular of thoracic outlet syndrome = TOS so that one possible cause is that the compression of the subclavian artery/vein as it passes through the inter scalene triangle by to muscle bodies at the scalene muscle which is available to muscular hypertrophy.This Allen test is part of to diagnostic work-up for the vascular abnormalities in the upper limb like in the thoracic outlet syndrome = TOS.This Allen test is performed whenever intravascular access to the radial artery is planned/for selecting the patients for the radial artery harvesting, like as for the coronary artery = bypass grafting/for forearm of flap elevation.This Allen test is a first-line standard test that is used to assess the arterial blood supply of the hand.The MAT = Modified Allen test efficiently evaluates the adequacy of the circulation of collateral but it requires the testing of one hand at a time.In the normal Allen’s test, both hands are tested simultaneously by the examiner which is compressing the one artery of each hand at the same time.This Allen test has since been adapted as to Modified Allen test = MAT.
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