That is interesting because I also go to NJH and they recommended a Bronchoscopy since I had a cavity that wasn't getting better but yet my sputum samples for 13 months all showed no MAC. Once I had the Bronchoscopy they not only found Abscessus but also Aspergillus. NJH and my Pulmonologist both said the Bronchoscopy gives a true sample and reading better than sputum samples. It's not something to do often but if needed in my case it was a blessing to finally find the culprit and get on the proper treatment.