A microchip for testing a blood property, comprising first and second channels for allowing a blood sample(s) to flow inside, wherein the first channel has a first reaction section coated with collagen and tissue thromboplastin; and said second channel has a second reaction section, wherein the second section has been coated with collagen and tissue thromboplastin the amount of which is equivalent to or smaller than the amount of tissue thromboplastin on said first channel, or the second section has been coated with collagen but not with tissue thromboplastin.