Peripheral blood smear, also called blood film, is a widely used technique to analyze the morphology of blood cells (Figure 1). Here, a very thin blood film is produced (Figure 2) and subjected to staining for microscopic analysis of the cells. Commonly used staining techniques include Giemsa, Romanowsky, and Wright's stain.

Figure 1: Example blood smear stained with Giemsa.

Figure 2: Steps to create a peripheral blood smear.