How are blood cells counted in a hematology report?

Usually automated: Blood cells are counted electromechanically as each blood cell is passed thru a really small Loop that acts as counter of number and size in one way.Another way is counting by laser reflections and in both,computers figure what type. The smallest are platelets, followed by red cells,and largest are all types of blood cells. In manual counting, a pathologist IDs blood cells microscopically