A number of platelet types are available at Canadian Blood Services (acronyms are further described in the terminology table):
Because platelet units consist of platelets resuspended in plasma or plasma and platelet additive solution (PAS), they are opaque and vary in colour from beige to yellow. Residual RBCs in platelet units may cause a pink or marked red colouring. There are several conditions or characteristics that are associated with a change in appearance of platelet units. Whether or not a blood component is suitable for transfusion is determined by local hospital policy and procedures.
Post-production manufacturing such as irradiation does not significantly change the appearance of platelet units but will affect the label.