My insurance only required the psych eval. and dietician consult, but my surgeon required sleep study, ekg, egd, pulmonary function test, lab work and chest x-ray. I am glad these test were in place - I now know I have sleep apnea and the egd revealed that I have an inflamed esophagus and stomach (which I am now treating). I say test away especially if insurance covers it. In the long run it can only benefit you!! Good Luck!!