The LAS Calculator provided on this site functions according to the formula approved by the OPTN/UNOS Board of Directors, which is used by the OPTN match system in allocating lungs.

The following data elements are used in determining the LAS:

• Lung diagnosis
• Date of birth
• New York Heart Association Class
• Assisted ventilation
• Height and weight
• Diabetes
• Supplemental oxygen
• Percent predicted FVC
• Six minute walk distance
• Serum creatinine
• Pulmonary artery systolic pressure
• Mean pulmonary artery pressure
• Pulmonary capillary wedge mean