Patent ID: 8765474

Claim:
An automatic analyzer provided with a reaction chamber in which a quantity of a sample and a quantity of a predetermined reagent according to a test item which indicates a type of test are provided, and a controller configured to control an automatic analyzing process of the reaction chamber, the automatic analyzer comprising: a pipetting mechanism providing the predetermined reagent and a particular conditioning liquid to the reaction chamber; a photometric mechanism measuring properties of the sample by measurement of absorbance of a reaction liquid including the sample, the predetermined reagent and the particular conditioning liquid, a memory storing the quantity of the sample and the quantity of the predetermined reagent provided to the reaction chamber according to each test item and a predetermined target quantity of liquid in the reaction chamber, and wherein the controller is further configured to determine the particular conditioning liquid from amongst a plurality of different conditioning liquids corresponding to a plurality of test items and to control the pipetting mechanism to provide the determined particular conditioning liquid to the reaction chamber to control the properties of the reaction liquid within prescribed ranges in each test item in a quantity which is determined by subtracting the sum of the quantities of sample and reagent from the predetermined target quantity of liquid, which is predetermined commonly for the plural test items.