Age Bias in Allocation of Organ for Transplantation


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Donor selection is an integral part of the organ transplantation program. Various factors influence the selection process in the allocation of organs for transplantation. Left digit bias, a cognitive bias, is the psychological phenomenon in which the left most digit of a number disproportionately influences decision making.

American transplant centers as well as organ procurement organizations, the groups responsible for recovering organs from deceased donors in the United States, were less likely to accept or select organs from donors who were 70 years old when they died compared to those who were 69, new research found.


A previous study had revealed this type of bias is present when organizations decide whether or not to discard donor kidneys. Clare E. Jacobson, M.D., a general surgery resident at University of Michigan Health, was curious about whether the bias would still exist if the research encompassed all organ types.

Organ Donation: Life goes on

“Donated organs are a lifesaving resource, but there are many more people on the waiting list than there are available organs,” said Jacobson, the co-first author of this study. “We were interested in looking at how we could make small changes to optimize our current supply of deceased donor organs, with the goal of both serving the patients on the waiting list and honoring the gift of life these donors are providing.”

Left digit bias

Using data from the United Network for Organ Sharing, the nonprofit that manages the nation’s organ transplant system, Jacobson and her research team found that both OPOs and transplant centers were about 5% less likely to choose organs, regardless of their type, for those aged 70 versus 69. The results suggest that about 1 in 18 donors who are age 70 or older will have no organs selected for transplant, Jacobson said.

“This demonstrated bias is not limited to a single transplant center, OPO or even step in the transplant process and is seen across organ types,” Jacobson said. “In our role as stewards of these gifted organs and for all patients waiting for a transplant, interventions must target every step in the transplantation process to overcome our prejudiced thinking.”

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Of note: Left hand bias was not significant when organ acceptance and selection rates were compared for donors who were 60 versus 59, the researchers found. This may be because, in younger organ donors, age is less heavily weighted compared to metrics like weight, blood work and other health problems in the donor, Jacobson said.

Source: Eurekalert

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