Clues to species diagnosis via thin smear

	P. falciparum	P. vivax	P. ovale	P. malariae
Size of RBCs	Normal size (sometimes distorted and crenated)	Enlarged	Enlarged and usually oval in shape (with fimbriated ends)	Normal size
Number of parasites per RBC	May be multiple	Usually one	Usually one	Usually one
Typical form of trophozoite	Rings	Amoeboid, often fragmented	Compact and regular	Compact
Other characteristics	Banana-shaped gametocytes; black pigment in RBCs; schizonts rare	Schuffner's granules; often see gametocytes and schizonts	Schuffner's granules; often see gametocytes and schizonts	Often see gametocytes and schizonts

RBC: red blood cell.

Graphic 77935 Version 2.0

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