PURPOSE:To correct the measured value of a hemolyzed blood specimen even with respect to an item to be examined of which the concn. in an erythrocyte is higher than that in serum or plasma, by preliminarily calculating the relation between a grade of hemolysis and the value of an error given to the item to be examined from the values obtained from a large number of actual specimens obtained by destructing the erythrocyte separated from plasma by measurement. CONSTITUTION:At first, the relation between a grade of hemolysis and the value of an error given to an item to be examined brought about by hemolysis is preliminarily calculated with respect to the item to be examined of which the concn. in an erythrocyte is higher than that in serum or plasma. Next, the analytical operation of the item to be examined is carried out with respect to a blood specimen to obtain a measured value before correction. Further, the grade of the hemolysis of the blood specimen is calculated. Then, from the grade of hemolysis of said blood specimen, the measured value before correction is corrected based on the relation previously calculated. Further, the relation between the grade of hemolysis and the error value is set with a gradient and the tolerant width following the same and the value after correction of the measured value before correction is displayed as the value having the tolerant width. The gradient and the tolerant width are calculated for each group classified by a health state, an age and sex.
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