If you have COPD or asthma, then the CG will require a pulmonary function test. You can check out the medical NVIC 04-08 at http://www.uscg.mil/nmc/medical/default.asp that specifies all tests required for nearly all medical conditions. Take that with you to the Dr. so they know what to do and include with the physical. It WILL save you months of processing time if you have any medical conditions. I did that and had zero issues, where other people I work with ignored that advise and were out of work for months and going back and forth for this test, then that test, etc.