A peripheral blood smear can be used to examine red blood cells, white blood cells, platelets, and parasites in the blood. It involves making a thin smear of blood on a slide, air drying it, and staining it with Romanowsky stain for examination under a microscope. Under low power magnification, the smear can be examined for microfilaria. Higher magnification can be used to identify other malaria parasites. The smear provides information on cell counts, shapes, sizes, and other characteristics.