diaDexus will offer U.S.-based clinicians attending the American Heart Association (AHA) Scientific Sessions 2006 the opportunity to take a complimentary PLAC test, a simple blood test that measures lipoprotein-associated phospholipase A2 (Lp-PLA2), an important new marker of inflammation associated with heart disease and stroke due to plaque rupture. diaDexus representatives will perform blood draws on-site, and the results will be available within about seven days. Members of the media also may obtain a complimentary PLAC test by stopping by the diaDexus booth.