Surgeons have long faced a brutal constraint: the clock. Once a donor organ is removed, its viability decays rapidly, forcing a frantic race against time that determines who receives it and how well it will function. A new technique from researchers at Texas A&M University could rewrite that timeline entirely. By storing pig kidneys in a supercooled state for up to three days, the team has demonstrated that organs can not only survive but recover function faster than the current clinical gold standard.
How Supercooling Extends Organ Viability
The process, developed by Powell Palm and his colleagues, begins by removing a single kidney from a pig and flushing it with a standard preservation solution to remove blood—the same step used in human organ transplantation. The team then subjected the organs to different storage conditions. Some kidneys were kept on ice for two hours or 24 hours, mimicking conventional clinical methods. Others were placed in a specialized supercooling device for 24, 48, or 72 hours.
After storage, each kidney was transplanted back into its original donor pig in a procedure that also removed the animal’s second kidney, leaving it entirely dependent on the stored organ. The results were striking. Kidneys stored for 24 hours in the supercooled device began producing urine immediately after transplantation—a direct sign of regained function. Within about ten days, the organs appeared to be working normally based on multiple markers of kidney performance.
Powell Palm notes that this recovery timeline is slower than for kidneys stored on ice for just two hours but significantly faster than those kept on ice for a full day. More remarkably, the organs stored for 48 and 72 hours performed similarly well. “Even at three days—triple the clinical standard—we’re getting recovery that is faster than … [what has been] the gold standard for the last three decades,” he said. “So we’re really, really pumped about this.”
This finding is significant because the current clinical standard, static cold storage on ice, is generally considered reliable only up to about 24 hours for kidneys. Extending that window to three days without sacrificing—and perhaps improving—organ function could fundamentally change how transplant logistics are managed.
Organs That Grow With the Recipient
The supercooled kidneys also demonstrated remarkable long-term resilience. Over 30 days, the pig recipients grew by approximately 30 percent, and their single transplanted kidneys adapted accordingly, nearly doubling in size to compensate for both growth and the absence of a second kidney. The team monitored one pig for 200 days before removing its kidney for analysis; the organ appeared healthy even at that late stage. These findings were presented at the American Transplant Congress in Boston last month.
Heidi Yeh, a transplant surgeon at Mass General Brigham for Children who researches organ preservation technologies, found the results compelling. “Often kidneys that have been stored for 48 hours [in other studies] take a week or two before they start working again,” she noted.
Comparable work is emerging from Canada. Earlier this year, a separate team demonstrated that pig kidneys could be cooled to below-zero temperatures using a cryoprotectant protocol. In that study, organs were stored for up to 48 hours and survived for a week after transplantation into pigs. The Texas A&M approach, however, appears to achieve longer storage times—up to 72 hours—with faster functional recovery.
What This Means for Transplant Medicine
What is the practical implication of extending kidney storage from 24 hours to 72 hours?
A three-day window transforms organ matching from a regional scramble into a globally coordinated operation. Organs could be shipped over longer distances, complex cross-match testing could be performed without time pressure, and recipients could be prepared optimally before surgery. The ability to pre-screen and plan surgeries more deliberately would reduce the number of organs that are discarded simply because they cannot reach a suitable recipient in time.
For patients on transplant waitlists—where every day of delay carries risk—this technology potentially opens the door to better matches and smoother surgical outcomes. For transplant centers, it means fewer wasted organs and more flexible logistics.
Who Should Watch This Development
For surgeons, organ procurement organizations, and medical device developers, this work represents a tangible step toward solving one of transplantation’s most persistent bottlenecks. While the results are currently limited to pigs, the biological parallels to human kidneys are well established, and the preservation technique uses a modified version of solutions already approved for human use. The next logical step is a clinical trial in humans, though the timeline for that remains uncertain.
For technologists and investors in medical devices and biotechnology, this is a signal that niche thermal regulation and cryopreservation technologies are maturing. The supercooling device itself is not yet named or commercially available, but its demonstrated performance in an animal model lays the groundwork for a product that could be evaluated by transplant centers.
For anyone following the broader field of organ preservation, the convergence of supercooling techniques from multiple independent labs—Texas A&M and the Canadian group—suggests that below-zero storage is moving from experimental curiosity toward practical viability. The key metrics to watch in future studies will be storage duration, functional recovery speed, and long-term organ health in larger animal models and, eventually, humans.
For now, the message is clear: the window for organ storage is no longer fixed at one day. The engineering of supercooling is pushing it toward three, and may push further still.
