Supercooled pig kidneys kept at -4°C for 3 days beat the 30-year gold standard

Time is the enemy of organ donation. A kidney on ice deteriorates fast, and surgeons have roughly 24 hours to get it into a recipient before it’s too degraded to use. That brutal clock is a major reason why around a third of donated kidneys get discarded and 17 people die every day in the US waiting for a transplant. Matthew Powell Palm and his team at Texas A&M just rewrote the rules. They’ve transplanted pig kidneys that were supercooled to -4°C (25°F) and stored for three days without forming a single ice crystal. The result? Those organs bounced back faster than kidneys kept on ice for 24 hours, the current clinical standard.

The trick is a deceptively simple device that keeps the organ at a constant pressure, which prevents ice formation at subzero temperatures without needing to flood it with cryoprotectant chemicals. “I always describe this as low-tech high science,” Powell Palm told MIT Technology Review. His team flushed pig kidneys, stored them in the pressure-controlled chamber for 24, 48, or 72 hours, and then transplanted them back into the donor pigs. The 24-hour supercooled kidneys started making urine the moment they were reconnected—a sign of immediate function. It took about 10 days for the organs to normalize, a recovery that was slower than a two-hour ice bath but dramatically quicker than the standard 24-hour cold storage method.

Even the three-day kidneys, which were preserved for triple the clinical limit, delivered a faster recovery than what Powell Palm calls “the gold standard for the last three decades.” He’s understandably pumped about that. The team also spent years modeling the thermodynamics to make sure ice wouldn’t crash the party. It’s a clever workaround to a problem that has stymied researchers for ages: we can freeze sperm and embryos just fine, but a whole kidney has always been too complex and prone to ice damage.

The potential here isn’t just about buying time to find a match. Longer preservation windows could fundamentally change how organ allocation works, reducing the frantic, overnight cross-country sprints and slashing the discard rate. Kevin Myer, CEO of organ procurement organization LifeGift, called the work “a landmark achievement.” The question now is how quickly this low-tech high science can move from pigs to the more than 104,000 people on a human kidney waitlist.