PROBLEM TO BE SOLVED: To provide a blood processing system for collecting plasma-reduced platelets and predicting plasma reinfusion.SOLUTION: The blood processing system comprises a vein access device 24, a blood component separation device 12, a first blood reinfusion line 28, a recirculation line 43, and a second blood reinfusion line 93. The vein access device uses a first pump P1 to collect blood from a subject and reinfuses the blood components to the subject. The blood component separation device separates the collected blood into first blood components and second blood components, and transfers the first blood components to a first blood component bag 18. The first blood reinfusion line connects fluidly the vein access device and the blood component separation device. The recirculation line connects the first blood component container and the separation device. The second blood reinfusion line connects fluidly the first blood component container and the first blood reinfusion line, and reinfuses the first blood components in the first blood container to the subject.
