Automatic analzyer

An automatic analyzer comprising:

• storage means for storing measurement results of quality control samples each having a plurality of known concentrations which plurality of known concentrations are different from each other;
• calculation means for calculating at least one of an average, coefficient of variation, and standard deviation, of the plurality of measurement results stored in said storage means;
• classification means for classifying the at least one of the average, coefficient of variation, and standard deviation, calculated by said calculation means in each of the measurement results in each of the plurality of known concentrations of the measured quality control samples;
• and
• registration means for registering combinations of variation patterns of said measurement results of each of said plurality of known concentrations of said quality control samples of the at least one of the average, coefficient of variation, and standard deviation, as classified by said classification means.