How can the kidney transplant system be improved?

Dialysis patient
In this Dec. 28, 2001 file photo, John Matheny has one of his three weekly sessions at the Morgantown Dialysis Center where he receives his kidney dialysis treatments, near Granville, W. Va.
Dale Sparks/ASSOCIATED PRESS

Nearly 18 percent of donated kidneys were discarded last year, according to The New York Times, and some believe that at least some of those kidneys could be transplanted if the system for matching them to potential recipients were improved. What does the system need to be more efficient?