Abnormality determining method, and automatic analyzer

An automatic analyzer that performs a qualitative or quantitative analysis on a sample, the automatic analyzer comprising:

• a spectral detector configured to acquire a plurality of items of measured data in a reaction process of a reaction solution contained in a reaction container in which a sample and a reagent are mixed and reacted with each other when the reaction solution is irradiated with light;
• a storage device configured to store various programs for analyzing the sample;
• and
• a processor configured to read the various programs from the storage device and execute a prescribed operation on the plurality of items of measured data based on the various programs, wherein
• the processor is configured to execute the following processing:
• acquisition of an acquisition condition for the plurality of items of measured data during the reaction process of the reaction solution containing the sample and the reagent,
• acquisition of a plurality of items of measured data that are detected using the spectral detector, and that match the acquisition condition,
• calculation of a feature quantity of the plurality of items of measured data,
• generation of a determination criterion to be used in determination of a presence or absence of an abnormality in the reaction process of the reaction solution, on the basis of the feature quantity of the plurality of items of measured data;
• and
• determination of a presence or absence of an abnormality in the reaction process by means of a comparison between the feature quantity of the measured data that is a subject of the determination, and the determination criterion, and
• the acquisition condition includes, at least, information relating to a measurement range, information relating to the number of divisions of a measured value range, and information relating to the number of items of data in each divided segment.