Protocol for the Ischemic Forearm Test. The test is performed by contracting the forearm to fatigue with a blood pressure cuff inflated to greater than systolic pressure. Antecubital blood samples for lactate and ammonia are collected before and following exercise at 0, 1, 2, 5, and 10 minutes.dson’s Test for Thoracic Outlet Syndrome. Procedure: Adson’s maneuver is a test looking for the reduction or obliteration ot the radial artery pulse with compression at the interscalene triangle. The examiner extends and rotates the patient’s shoulder with the arm at the patient’s side.