I've already done the 35 mut gene test and the sweat chloride recently. The clinic I'm going to is doing another sweat test and 35 mut test. I'm wondering why are they just redoing tests that are already done, seems like a giant waste. I figured they would automatically want to do the full 1400 mut Ambry test. Sweat chloride was positive, missing vas defs, 35 mut test found one: f508. They said it's not established yet whether I have CF or not. Seems to me they need to do the more extensive test to find the second mut to prove/disprove this and get more info. This really doesn't make sense to me. Did you guys find you had to push for the Ambry test?