I know the 6 months but im not certain yet if it has to be back to back months. Luckily my S-N-L is also getting the surgery and she just went yesterday. She said an ekg, blood work, a dye test (which im trying to clarify as can be multiple things) I'm also trying to get ahead of the game so to speak. I'm having my pcp do all my test then send over another ref because she made a typo on original ref so it got pushed back.So when I go in ill have basically everything done and will only have to do the pshy and nutr with them. This is my list for test that i'm requesting from pcp and shouldn't take to long maybe a month to get done. EKG,Sleep study,complete blood count(CBC), kidney,liver&blood sugar test, chest x-ray,heart stress test and lung function test. Covering all my basics and no of these can hurt your process only help you. As I know some of these are going to come back as abnormal. ex: stress test,sleep study. keep in touch so we can help each other along the way. oh and get into a support group now!! their meetings are every 3rd Thursday 6:30-7:30. This Thursday is actually one. gives you huge brownie points with surgeons.