Patent ID: 7150857

Claim:
A measurement instrument that carries out a measurement of a reagent in accordance with items to be measured and that carries out a deterioration correction of measurement data in accordance with deterioration of the reagent used for measurement over time, the measurement instrument comprising: a reagent carrier that carries a reagent in accordance with items to be measured; an information indicator, in which reagent information including information necessary to designate a lot and a date of manufacture is recorded, being attached to the reagent carrier; a deterioration correction data storage unit that stores a deterioration correction data table containing deterioration indices showing a deterioration over time from the date of manufacture to an expiration date at plural time points on a time series for each lot of the reagent carrier; an indicator reading unit that reads the reagent information from the information indicator attached to the reagent carrier to be measured; a measurement date obtaining unit that obtains a measurement date when the measurement is executed; and a measurement controlling unit that designates the deterioration correction data table corresponding to the lot of the reagent carrier to be measured with reference to the deterioration correction data storage unit based on the reagent information read by the indicator reading unit, calculates a deterioration index by interpolation at the measurement date based on the deterioration indices at a preceding time point and a following time point of the measurement date among deterioration indices recorded in the designated deterioration correction data table, and carries out a deterioration correction of the measurement data based on the calculated deterioration index.