In the OPTN lung allocation system, every lung transplant candidate age 12 and older receives a lung allocation score, which, combined with blood type, and the geographic distance between the candidates and the hospital where the lung donor is located, is used to determine priority for receiving a lung transplant when a donor lung becomes available. Lungs from pediatric and adolescent donors are offered first to pediatric and adolescent transplant candidates before they are offered to adults. The following medical information is used to calculate a lung allocation score from 0 to 100 for each transplant candidate:

• Forced Vital Capacity
• Pulmonary Artery Pressure
• Oxygen at rest
• Age
• Body Mass Index
• Diabetes
• NYHA Functional Classification
• 6-minute walk distance
• Assisted ventilation
• Pulmonary Capillary Wedge Pressure
• Serum Creatinine
• Disease Diagnosis.