Giant platelets increased mean platelet volume giant platelets 2017-07-13T09:54:05Z MP:0030025 presence of abnormally enlarged platelets that are as large as or larger than the red blood cells in the microscopic field; giant platelets may be seen in myeloproliferative and myelodysplastic conditions, autoimmune thrombocytopenia, in association with severe leukemoid reactions, and in rare inherited conditions such as Bernard-Soulier syndrome giant platelets