Study population flow chart for the analysis of recovery of pulmonary function after HCT. The results of PFTs were classified as normal or abnormal based on the algorithm published by Pellegrino et al. [14]. Patients with restrictive, obstructive, and mixed defects were categorized as abnormal; all others were categorized as normal. All patients had a minimum of 3 readings, including pretransplantation PFTs, post-transplantation PFTs, and the most recent PFTs. The series of 188 patients were categorized as with or without pulmonary complications and with normal or abnormal pretransplantation and post-transplantation PFTs. Recovery indicates that normal pulmonary function was restored.