http://labmed.ascpjournals.org/content/32/7/361.full.pdf This is the original study that led to the article you linked earlier. It is written by Gabriele Mues, MD, Frank H. Wians, Jr, PhD, MT(ASCP), DABCC, FACB, and Steven H. Kroft, MD, FASCP From the Department of Pathology, University of Texas Southwestern Medical School, Dallas, TX. "1. Vortexing of blood specimens has been reported to be successful incompletely breaking up platelet clumpsin approximately half of EIPA cases.10Either the entire tube or an aliquot ofblood may be vortexed for 1 to 2 minutesat the highest vortex setting withoutadversely affecting CBCparameters. A postvortex peripheralblood smear should be examined to determinethe efficacy of this procedure before reporting the platelet count." the study may have been performed in 2001 but that doesn't mean its outdated. I would venture that these individuals are intelligent and knowlegeable even if i'm not.