An automatic analyzer comprising: an analyzer for analysing a sample in accordance with a first analysis item and in response to a first request for a normal treatment; and a controller for associating measurement data and for storing the measurement data on the sample analysed, wherein the controller is configured to associate, with identification information used to identify a sample subjected to a special treatment for an unusual condition, the measurement data on the sample analysed by the analyzer in accordance with the first analysis item and in response to a second request that is a request for re-examination, is different from the first request and is made for the special treatment for an unusual condition, to store the measurement data associated with the identification information used to identify a sample in a database dedicated for a normal sample, to further associate the measurement data on the sample analysed by the analyzer in response to the second request with a content of the special treatment for an unusual condition, and to store the measurement data associated with the sample accompanied by an unusual condition as a sample accompanied by an unusual condition with the content of the special treatment, characterized in that a re-measurement request screen is provided to show procedures of special treatment to be performed by an operator before re-measurement in the case where the sample accompanied by the unusual condition is treated without a suspension of the automatic analyzer; that the analyzer is configured to perform a re-measurement after the procedures of special treatment have been performed on the sample; that the controller is configured to store the procedures of special treatment and times which are stored by the operator when the procedures of special treatment have been performed in a database dedicated for a sample accompanied by an unusual condition, and that a special treatment trace screen is provided to display the times which are stored by the operator and to display the contents of the procedures of special treatment accompanying an unusual condition. an analyzer for analysing a sample in accordance with a first analysis item and in response to a first request for a normal treatment; and a controller for associating measurement data and for storing the measurement data on the sample analysed, wherein the controller is configured to associate, with identification information used to identify a sample subjected to a special treatment for an unusual condition, the measurement data on the sample analysed by the analyzer in accordance with the first analysis item and in response to a second request that is a request for re-examination, is different from the first request and is made for the special treatment for an unusual condition, to store the measurement data associated with the identification information used to identify a sample in a database dedicated for a normal sample, to further associate the measurement data on the sample analysed by the analyzer in response to the second request with a content of the special treatment for an unusual condition, and to store the measurement data associated with the sample accompanied by an unusual condition as a sample accompanied by an unusual condition with the content of the special treatment, characterized in that a re-measurement request screen is provided to show procedures of special treatment to be performed by an operator before re-measurement in the case where the sample accompanied by the unusual condition is treated without a suspension of the automatic analyzer; that the analyzer is configured to perform a re-measurement after the procedures of special treatment have been performed on the sample; that the controller is configured to store the procedures of special treatment and times which are stored by the operator when the procedures of special treatment have been performed in a database dedicated for a sample accompanied by an unusual condition, and that a special treatment trace screen is provided to display the times which are stored by the operator and to display the contents of the procedures of special treatment accompanying an unusual condition.