In recent years, a multi-purpose apparatus or an integrated apparatus used for both a biochemical analysis and an immunological analysis, obtained by equipping a biochemical analyzer with modules handling various kinds of immunological assay menu; and a composite apparatus obtained by installing a biochemical analysis module and an immunological analysis module into an automatic analyzer, have been developed along with the trend of labor saving in testing rooms.
However, the immunological assay menu has an extremely large difference in numerical values between normal values and abnormal values. Even with a minute amount of carry-over between samples, which is not considered to be problematic in a biochemical assay menu, there is a possibility of causing a false positive judgment due to the carry-over. Thus, in order to prevent carry-over between samples in such a multi-purpose apparatus or an integrated apparatus for a biochemical analysis and an immunological analysis, an automatic analysis system is disclosed which performs an immunological analysis first and a biochemical analysis subsequently, and which inserts a dispensing probe in the interior of a sample to reduce the influence of carry-over when there is a necessity of performing a retest in immunological assay menu (e.g., see Patent Reference 1).
Further, an analysis method is disclosed in which a disposable nozzle tip is used for the dispensing of assay menu with a high carry-over avoiding level, a repeatedly used nozzle is used for the dispensing of assay menu with a low carry-over avoiding level, and the analysis of the assay menu with a low carry-over avoiding level is performed when it is judged that a retest is not necessary from an analysis result of the assay menu with a high carry-over level (e.g. see Patent References 2 and 3).
Patent Reference 1: Japanese Patent No. 3845301
Patent Reference 2: Japanese Patent No. 3380542
Patent Reference 3: Japanese Patent No. 4101466