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Kidney Allocation System

In late 2020, new kidney allocation policies will go into effect that update how offers in the kidney allocation system (KAS) are sequenced. Instead of match sequencing relying on donation service area (DSA) and OPTN Region, kidney allocation will be based on geographical distance between donor and recipient. Toolkits have been developed for OPO and transplant professionals to learn more about the policies and the changes they will bring.

Kidney Allocation System (KAS)

The OPTN implemented KAS in December 2014. KAS was developed in response to higher-than-necessary discard rates of kidneys, variability in access to transplants for candidates who are harder to match due to biologic reasons, inequities resulting from the way waiting time was calculated, and a matching system that results in unrealized life years and high re-transplant rates. The aspects of KAS addressing prioritization of transplant candidates, including EPTS, and of assessing donor longevity potential, including KDPI, will not change as a result of policies affecting kidney distribution.

Find instructions related to KAS below.

KAS Featured Reports

KAS two-year analysis (7/2017)

Equity in access report (8/2017)

KAS Instruction

The following KAS webinar recordings are available on UNOS Connect:

  • Introduction to the new kidney allocation system
  • What your candidates need to know about KAS (English)
  • What your candidates need to know about KAS (Spanish)
  • KAS resources for protocols and processes
  • KAS town hall Q&A answer session

KAS Policy & Guidance

KAS Patient Resource


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