The Kidney Donor Risk Index (KDRI) combines a variety of donor factors to summarize the risk of graft failure after kidney transplant into a single number. The KDRI expresses the relative risk of kidney graft failure for a given donor compared to the median kidney donor; values exceeding 1 have higher expected risk than the median donor, and vice versa.

The KDPI is a remapping of the KDRI onto a cumulative percentage scale, such that a donor with a KDPI of 80% has higher expected risk of graft failure than 80% of all kidney donors recovered last year and can be used to compute KDPI and KDRI for a hypothetical or actual donor. The calculations and assumptions mirror those used for computing KDPI and KDRI in DonorNet^®.

Two factors that originally were included in the KDPI calculation were removed in October 2024. These were whether the donor is Black or African-American, and whether the donor had tested positive for hepatitis C. These factors were removed to improve equity in organ allocation and to reflect updates in medical treatment. Read more details.

• If diabetes or hypertension statuses are unknown, the calculator will assume the donor has the same chance as a randomly selected donor having the condition.

• Guide to calculating & interpreting KDPI (PDF; 10/2024)
• KDPI mapping table (PDF; 10/2024)
• KDPI guide for clinicians
• Archives for KDPI mapping tables