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In order to evaluate the interference of blood cells on platelet aggregation, spontaneous platelet aggregation (SPA), ADP, and collagen-induced platelet aggregation were investigated in whole blood by the impedance method and in platelet-rich plasma (PRP) by densitometric and impedance aggregometers. Stirring of the sample induced a significant decrease of neutrophils (P less than 0.001) but no changes of red blood cell (RBC) and platelet count. After collagen addition, a further decrease of neutrophils was observed, while RBC count was unmodified. The occurrence of SPA was not different in whole blood and in PRP. Platelet number and hematocrit did not affect either spontaneous or collagen-induced aggregation. A significant linear relation (r = -0.60, P less than 0.01) between neutrophil count and collagen whole blood platelet aggregation was found. Collagen- and ADP-induced aggregation were significantly higher and lower, respectively, in whole blood than in PRP using the densitometric method. No differences were observed in SPA and collagen platelet aggregation according to age and sex.
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