Targeted Priority Mechanism Could Add Over 900 Kidney Transplants Annually

Researchers at Virginia Tech and collaborating institutions modeled a voluntary program inspired by the Eurotransplant Senior Program. Older candidates who accept marginal kidneys receive priority on the waiting list but forgo offers outside that pool. The simulation integrated patient choice models with machine learning predictions trained on historical U.S. allocation data to forecast participation and organ acceptance rates.

Current system discards roughly 20 percent of donated kidneys partly due to provider heuristics and biases. The new rules shift marginal organs to willing older recipients faster while preserving higher-quality kidneys for younger patients with longer expected post-transplant survival. Model outputs indicate net gains for both groups when participation thresholds remain flexible.

The approach avoids mandatory redesign of OPTN policy yet still requires careful calibration to prevent gaming or inequitable uptake. Next steps include stakeholder consultations with transplant centers to test real-world acceptance patterns and refine offer sequencing before any pilot implementation.

Evidence quality note: The study is a computer simulation calibrated on observational data; it cannot capture unmodeled behavioral responses or regional variation in donor supply.