A sample analyzer is disclosed. In one embodiment, the sample analyzer includes an analysis section for analyzing a sample by using a reagent to obtain numerical data and distribution diagram of particles contained in the sample; a display device; an information receiver for receiving an input of reagent information assigned to the reagent; a determination section configured for determining whether or not the reagent satisfies a condition to determine that the reagent is a genuine product based on the reagent information; and a controller that controls the display device to display both the numerical data and the distribution diagram if the reagent satisfies the condition by the determination section and to display the numerical data without displaying the distribution diagram if the reagent does not satisfy the condition by the determination section.