In a field where time can be the difference between life and death, a Nordic organ exchange program is showing how cross-border cooperation can deliver results—and now it’s positioning itself for a European expansion.
The Scandiatransplant Exchange Program, or Step, connects kidney patients with willing but incompatible living donors to others across the region. A shared database and matching algorithm turn isolated national donor pools into a single, more efficient network. The result: higher match rates, shorter waiting times, and lives saved that otherwise might have been lost in the queue.
Here’s how it works. When a donor-recipient pair is incompatible, they’re entered into Step’s registry. Four times a year, an algorithm from Lund University searches for optimal swaps, from simple two-way trades to complex three- or four-pair chains. The logistics are intense: surgical teams in multiple countries must coordinate down to the hour, since kidneys can only survive outside the body for a few hours.
The concept began in 2012 with mathematician Tommy Andersson, who applied game theory to transplant matching. The first successful exchange happened in 2018. Since then, Step has typically involved around 30 donor–recipient pairs in each matching cycle.
The program is now preparing for a step-change in scale. Backed by EU funding, Step aims to run its first Europe-wide exchanges in 2026, with full operational rollout in 2027. The expansion could transform the odds for thousands of patients, creating the continent’s largest living-donor kidney exchange network.
For Per Lindner, head of the Transplantation Centre at Sahlgrenska University Hospital, the growth case is clear: “Every additional country in the network increases the probability of a match. The mathematics are compelling—and the human stakes are obvious.”
If the plan works, Step could become a model for how highly specialized medical services are organized in Europe: coordinated, data-driven, and borderless. For patients, it’s the difference between years on dialysis and the chance at a normal life. For policymakers and health systems, it’s proof that integration can deliver tangible, measurable benefits.