One change would allow doctors to retrieve organs right away, rather than waiting two minutes to see if the patient's heart starts beating again.
The United Network for Organ Sharing always wants to lift the ban on allowing patients to be organ donors before their doctors and families have given up hope of trying to save their lives.
Critics worry the changes will increase the risk that dying patients will have their care compromised.
Supporters, on the other hand, say it would strengthen the transplant program.
