blood film(A blood film–or peripheral blood smear–is a thin layer of blood smeared on a glass microscope slide and then stained in such a way as to allow the various blood cells to be examined microscopically.: A blood film is a snapshot of the cells that are present in the blood at the time that the sample is obtained. To produce a blood film, a single drop of blood is spread in a thin layer across a glass slide, dried, and then stained with a special dye.wikipedia.org)
