The Exdia TRF systems are lightweight portable instrument that process whole blood, serum or plasma samples in self-contained, single-use reagent cassettes. Along with fully automated processing and onboard data handling, the Exdia TRF systems incorporate a unique process called Exdia IQC (Internal Quality Control). The Exdia IQC ensures that operator reports accurate and reliable results. To measure the concentration of Exdia IQC, the tested cassette should be read by Exdia TRF Plus analyzer. The analyzer can analyze intensity of three test lines and convert it to some numerical values. The values are then calculated as ratios of each line and if the ratios are within the acceptable range in comparison with the reference value previously set, the performance of the Exdia TRF Plus analyzer is considered to be stable and maintained.