Shunt Study Make an Appointment Ask a Question Refer Patient Reviewed by Amy Olson and George Zeman (September 01, 2015) A shunt study is a procedure to assess heart and lung blood circulation. Performing the test You will sit in a comfortable chair on a mouthpiece wearing noseclips. You will breathe normally on the mouthpiece for approximately 20 minutes breathing 100 percent oxygen. An arterial blood gas will be taken from your wrist to be analyzed immediately. A technologist will instruct you on how to perform the test and coach and encourage you to do your best. This information has been approved by George Zeman BS, RRT, CPFT and Amy L. Olson, MD, MSPH (September 2015).