Excellent question. It's good to see attention being given to the different types of PRP systems. It can be confusing with so many different PRP systems on the market. It would be great if they all produced consistent, concentrated PRP but unfortunately this is not the case. This is apparent even on the visual appearance of PRP. An interesting demo was done at a major conference in Europe where one researcher donated blood on stage and PRP was prepared using 8 different PRP systems. The PRP samples all looked different, ranging in color from straw-yellow to deep blood-red and concentrations of platelets, red blood cells within also varied by several orders of magnitude.