Sweat test is abnormal for my six year old... Lots of questions while waiting for further testing

My 6 year old has had complications from birth. At 6 weeks old he was hospitalized for an extended length in time for R.S.V. and has issues since then. He has had bronchitis a few times, croup, had two adenoid removal surgeries, a tonsillectomy, been diagnosed with chronic sinusitis, and is generally always sick. He coughs up lots of dark green phlegm, and has coughed up blood before (which has been said to be due to the sinusitis). He also just has his nasal passages opened because the infection was to thick to drain on it's own. Meds don't clear it up.We recently started seeing a new doctor because his last doctor kept saying it was allergies and asthma and all of the medication he put him on wasn't working. The new doctor wanted to start over and rule out everything to try to get to the bottom of his illnesses and sent him for a sweat test. I received a phone call yesterday that his test results were abnormal (his sodium chloride level is a 53) and we are now being referred to a children's hospital for further testing. I was just wondering what the outcome of the second tests may be and how likely it is that he would be diagnosed with cystic fibrosis or atypical cystic fibrosis. He is mildly salty when I kiss him and his bowel movements are sticky and tar like at times, and also strange colors (like bright blue, green or yellow). Please any advice or comments are welcome

Thank you so much!!!! I really appreciate any help I can get.

I was told by my sons Polmonologist the Chief at Mount Siani NY that someone can have mutations of CF. Combinations of the mutation gene with a normal sweat test. There is a whole new category these people fall into. My Son is one of them. Hes 4 had a history of lung issues. He saw my sons lungs through a procedure called a bronchoscopy. His first thought for diagnosis was some form of genotype of CF. Not full blown CF.