Automatic analysis device and automatic analysis method

An automatic analysis method of an automatic analysis device which has at least a specimen container holding unit that accommodates and holds a plurality of specimen containers, a specimen dispensing mechanism, a reagent dispensing mechanism, a measurement unit, and a control unit, the method comprising:

• causing the specimen dispensing mechanism to dispense subject blood plasma and/or normal blood plasma to be added to correct a coagulation time of the subject blood plasma, to a plurality of specimen containers accommodated in the specimen container holding unit;
• preparing mixed blood plasma obtained by mixing the subject blood plasma and the normal blood plasma at least at one mixing ratio, inside the specimen containers;
• causing a reaction container to contain the mixed blood plasma which are prepared, and causing the reagent dispensing mechanism to dispense a reagent to the reaction container;
• causing the measurement unit to irradiate the mixed blood plasma to which the reagent has been added in the reaction container with light emitted from a light source, and measure the coagulation time, based on obtained scattered light and/or transmitted light;
• and
• causing the control unit to determine whether to perform the analysis based on the number of the mixed blood plasma and the number of the reagent remaining tests.