Smear preparation apparatus, blood sample processing system, and method of washing blood processing unit of the smear preparation apparatus

A smear preparation apparatus comprising:

• a blood processing device comprising a tubular member to suck a blood sample from a test tube and a smearing device to smear the blood sample on a glass slide;
• a washing device comprising a washing liquid conduit and a liquid dispenser configured to wash interior and exterior surfaces of the tubular member in the blood processing device under a first washing condition after the processing of the blood sample;
• at least one controller executes program code stored in a non-transitory memory to control operations of the blood processing device and the washing device;
• and
• an information obtaining device comprising a communication interface coupled to a blood cell analyzer configured to obtain information regarding blood cells in the blood sample;
• wherein the at least one controller is configured to;
• determine an occurrence of immature white blood cells in the blood sample based on the information regarding blood cells in the blood sample received by the information obtaining device, and
• in response to determining the occurrence of immature white blood cells in the blood sample, control the washing device to change the first washing condition to a second washing condition to be washed by the washing device, wherein the second washing condition is stronger than the first washing condition, wherein a stronger washing condition includes using at least one or a combination of:
• a washing liquid of high strength, higher number of wash cycles, longer washing cycles and larger volume of washing liquid.