Disclosed herein are a test instrument and a method of controlling the same, capable of performing a basic test on a sample of a patient, determining whether to perform an additional test, and displaying interfaces associated with a progress level, a necessary time, etc. of the additional test on a display unit when the additional test is performed, thereby enabling a user to visibly recognize information associated with a performing process of each test. The test instrument includes: a detection unit configured to apply light to at least one chamber in which a reaction between a reagent and a sample occurs and to detect an optical signal from the chamber to test the sample held in a reaction device, a control unit configured to determine whether to perform a secondary test on the sample after a primary test is performed on the sample and to control to display a secondary test progress interface showing a progress level of the secondary test when the secondary test is performed, and a display unit configured to display a primary test progress interface showing a progress level of the primary test on the sample and to display the secondary test progress interface showing the progress level of the secondary test when the secondary test is performed on the sample.

There is provided an apparatus to predict a reaction amount of a third fluid flowing through a third flow channel obtained by a first fluid flowing through a first flow channel and a second fluid flowing through a second flow channel being mixed and reacted with each other, the apparatus comprising: an acquisition unit which acquires a first fluid spectrum of the first fluid, a second fluid spectrum of the second fluid, and a third fluid spectrum of the third fluid; a calculation unit which calculates a difference spectrum between the third fluid spectrum and a total spectrum of the first fluid spectrum and the second fluid spectrum; and a prediction unit which predicts a reaction amount of the third fluid using the difference spectrum.