One of the organs that can nowadays be transplanted is the lung. The procedure is carried out for a variety of reasons - for example, patients with cystic fibrosis or patients with advanced stages of chronic obstructive pulmonary disease. However, not every person struggling with an ailment that is sometimes an indication for lung transplantation is qualified for this operation: so what determines the need for it? What is the prognosis of patients who undergo lung transplantation?