Specimen analysis method and specimen analyzer

An immunoassay analyzer configured to measure a target analyte in a specimen, comprising:

• a measurement device configured to perform measurement on the specimen, the measurement device comprising:
• a sample dispenser configured to dispense the specimen into a number of containers, wherein the number of containers is determined by a number of target analytes requested to measure by a measurement order issued for the specimen;
• a reagent dispenser configured to dispense an aliquot of reagent into each of the containers to prepare measurement samples, wherein the reagent is prepared in different types that each contain a different labeled antibody bound to a specific target analyte in the measurement sample;
• and
• a light detector configured to detect light excited out from the labeled antibody bound to the target analyte in each of the measurement samples;
• and
• a controller programmed to control the measurement device to measure the target analytes in the measurement samples requested to measure by the measurement order and obtain measurement values on the measured target analytes based on amounts of lights detected by the light detector,
• wherein the controller is programmed to control the measurement device to:
• prepare a first measurement sample from one specimen to measure a first target analyte and a second measurement sample from said one specimen to measure a second target analyte in response to the measurement order requesting measurement of the first and second target analytes, wherein the first target analyte is a first type of protein, and the second target analyte is a second type of protein;
• and
• perform a first measurement on the first measurement sample to obtain a first measurement value representative of an amount of the first type of protein in the first measurement sample and a second measurement on the second measurement sample to obtain a second measurement value representative of an amount of the second type of protein in the second measurement sample,
• wherein the controller is programmed to perform the first measurement and perform the second measurement at a measurement interval after the first measurement is performed,
• wherein the controller is programmed to calculate an arithmetic relationship between the first measurement value and the second measurement value,
• wherein the controller is further programmed to set the measurement interval equal to or less than a predetermined time interval to suppress a decrease of reliability of a calculation result of the arithmetic relationship due to a temporal degrading of the first and second types of proteins, and wherein setting the measurement interval comprises at least one of (a) or (b):
• (a) determining by the controller, before preparation of the first and second measurement samples, if it is possible to perform the first and second measurements at a time interval equal to or less than the predetermined time interval, and wherein the controller is programmed to execute the preparation of the first and second measurement samples in response to a determination that the time interval is equal to or less than the predetermined time interval;
• or
• (b) determining by the controller, after performing the first and second measurements, if the second measurement has been performed within the predetermined time interval after the first measurement had been performed, and wherein the controller is programmed to execute the calculation of the arithmetic relationship between the first measurement value and the second measurement value in response to a determination that the second measurement has been performed within the predetermined time interval after the first measurement had been performed.