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Lung CAS summary data updated

Lung CAS summary data updated

Below is information for lung transplant program physicians, surgeons, transplant coordinators, program directors and data coordinators on the distribution of scores for all lung candidates registered in the U.S. It is intended as a point-in-time reference to help transplant programs understand how their candidates’ scores compare to the national distribution of components of the lung Composite Allocation Score (lung CAS).

Members can also use this information as a guide when submitting CAS exception requests for lung candidates. See the Lung Review Board Operational Guidelines and Clinical Guidance for more information on submitting exception requests.

The guidance includes specific recommendations for lung transplant candidates diagnosed with pulmonary hypertension (PH). Such candidates who meet the following criteria may qualify for an increase in their Waitlist Survival and/or Post-Transplant Outcomes Scores:

  1. Patient is deteriorating on optimal therapy, and
  2. Patient has a right atrial pressure greater than 15 mm Hg or a cardiac index less than 1.8 L/min/m2

To request an increase in a PH candidate’s scores, transplant programs must submit an exception request to the Review Board; this request should include sufficient clinical detail to support that the patient meets the above criteria. If the transplant program believes that its patient has similar waiting list mortality and potential transplant benefit as a PH patient meeting the criteria listed above, then it should provide a detailed narrative on that assertion, referencing literature supporting the request for a higher score. Transplant programs may wish to submit to the Review Board exception requests for the candidate’s Waitlist Survival Score and Post-Transplant Outcomes Score to be at the national 90th percentile for each goal (see tables below).

The distribution of Medical Urgency points, Post-transplant Outcomes points, and CAS subscores for all active candidates waiting for lung transplants as of March 1, 2023 are as follows:

Summary of Medical Urgency Goal Points and Percentage of Goal

Medical UrgencyNumber Waiting25th percentileMedian75th percentile90th percentile95th percentile99th percentile
Number of Points9830.12750.30250.60501.43003.080016.6250
Percentage of Goal9830.5100%1.2100%2.4200%5.7200%12.3200%66.5000%


Summary of Post-Transplant Outcomes Goal and Percentage of Goal

Post-Transplant OutcomesNumber Waiting25th percentile Median75th percentile90th percentile95th percentile99th percentile
Number of Points98318.920019.7825 20.495020.960021.412521.9600
Percentage of Goal98375.6800%79.1300%81.9800%83.8400%85.6500%87.8400%


Summary of CAS Subscore

Diagnosis GroupNumber Waiting25th percentile Median75th percentile90th percentile95th percentile99th percentile


Lung continuous distribution

New lung policy took effect March 9, 2023. Resources: UNOS Connect for professional education and the OPTN toolkit for patients and professionals.
Illustration of icons: hand icon with 3 arrows; one pointing up to lungs, one rising and pointing to right, one rising and pointing to left at balanced scale
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