Calibration of an automatic analyzer for reagent water evaporation

An automatic analyzer, comprising:

• a calibration curve generator configured to generate a first calibration curve indicating a first relationship between a concentration and an absorbance based on a result of first optical measurements of reaction solutions obtained by adding a reagent to reference samples each having a known, but different, concentration of an object to be detected, the calibration curve generator being further configured to generate a second calibration curve indicating a second relationship between the concentration and the absorbance based on a result of second optical measurements of the reaction solution obtained by adding the reagent to the reference sample, wherein the second optical measurements are performed after a predetermined time passes after the first optical measurements;
• and
• a correction coefficient calculator configured to calculate a correction coefficient for a correction function, the correction function indicating a correlation of a blank value and a gradient of a calibration curve based on:
• a first blank value, which is a blank value of the first calibration curve, wherein the blank value is the absorbance when the concentration of the object to be detected is zero;
• a first gradient, which is a gradient of the first calibration curve;
• a second blank value, which is the blank value of the second calibration curve;
• and
• a second gradient, which is a gradient of the second calibration curve,
• wherein the calibration curve generator is further configured to generate a corrected calibration curve, and the calibration curve generator is further configured to
• (1) calculate a corrected gradient of the corrected calibration curve with the correction function based on:
• (a) a third blank value, which is a blank value obtained from a result of a third optical measurement of the reaction solution when the concentration of the object to be detected is zero or a fourth optical measurement of the reagent after the correction coefficient is calculated, wherein the third optical measurement or the fourth optical measurement is performed after the second optical measurements, and
• (b) the correction coefficient calculated by the correction coefficient calculator, and
• (2) generate the corrected calibration curve based on the third blank value and the corrected gradient.