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Whole Blood Analysis of Leukocyte-Platelet Aggregates.

In inflammatory and thrombotic syndromes, platelets aggregate with circulating leukocytes, especially monocytes and neutrophils. This leukocyte-platelet aggregate formation is initiated primarily through platelet surface expression of P-selectin (CD62P), following activation-dependent degranulation of α-granules, binding to its constitutively expressed counter-receptor, P-selectin glycoprotein ligand 1 (PSGL-1), on leukocytes. Monocyte-platelet aggregates are a more sensitive marker of platelet activation than platelet surface P-selectin. Detection of leukocyte-platelet aggregates is relatively simple by whole-blood flow cytometry. Light scatter and at least one leukocyte-specific antibody are used to gate the desired population, and the presence of associated platelets is detected by immunostaining for abundant platelet-specific markers. © 2016 by John Wiley & Sons, Inc.