BRISBANE, Calif., Jan. 22 /PRNewswire/ -- For many Americans living with a heart transplant, invasive heart-muscle biopsies that check for organ rejection are a fact of life. However, a simple blood test that analyzes a patient's genes, introduced in 2005, has been evaluated by leading transplant centers, and their experience verified that it can accurately detect the absence of heart transplant rejection, according to data from a consensus team of international heart transplant experts that was published in the December 2006 edition of the Journal of Heart and Lung Transplantation (JHLT).