The aim of this project is to implement a clinical tool utilizing predictors of mortality for patients with Cystic Fibrosis (CF) on the waiting list to identify candidates that should present for urgent medical care and, if appropriate, will prompt clinicians to update a candidate's lung allocation score (LAS), the score used to prioritize lung transplant candidates for transplant by medical urgency, and avoid undetected decline. The clinical tool consists of home spirometry measures and patient reported outcomes that is completed weekly on a mobile application device used clinically to track spirometry.