[Problem] Provided are a blood inspection system, in which a condition of a patient can be chronologically measured by automatically repeating blood inspections a plurality of times at a desired interval and a desired timing and measuring a chronological change in a blood condition, a thrombus or the like is prevented from being formed, and a medicine is prevented from being overdosed, and a control method for a blood inspection system. [Means for Resolution] A blood inspection system 10 has a main flow path 121 through which a fluid circulates, a supply section 210 which supplies a cleaning liquid, a plurality of inspection units 300 which perform a blood inspection, a plurality of bifurcated flow paths 131 which guide blood to the plurality of inspection units, an aspiration unit 220 which aspirates blood, a discharge flow path 141, a switching unit 150 which is capable of selectively switching a communication state with respect to the main flow path, and a control unit 400 which controls an operation of each of the units of the system. The control unit causes the main flow path and one bifurcated flow path of the plurality of bifurcated flow paths to communicate with each other when performing a blood inspection using the plurality of inspection units such that blood is guided to one inspection unit of the plurality of inspection units, which has not yet performed an inspection.
