Provided is a method for checking a blood status including: a step of supplying blood to the centrifugal container of a disk; a step of rotating the disk to centrifuge the blood cells and blood plasma in the centrifuge container, and detecting the actual moving distance per hour of the blood cells in the centrifugal container; and a step of establishing a first graph which represents the actual moving distance of the blood cells per hour, and a second graph which represents the theoretical moving distance of the blood cells per hour, and thereafter calculating the hematocrit of the blood cells and the viscosity of the blood plasma by comparing the first graph with the second graph.