The KARDiVAR system is a computer system for measuring stress level evaluation by a heart rate variability analysis. The KARDiVAR system provides the non-invasive screening of HRV, IRSA and stress level using only 6 standard ECG leads, i.e. 4 wires only from the patient's wrists and ankles in sitting position, also the patient can be fully clothed. KARDiVAR system provides the analyzing and creating of stress level evaluation by analysis of heart rate variability and display it in the form of the scale "Traffic light", where the stress level zones is displayed by colors, which are simple for interpretations. The system also provides the analyzing and showing basic parameters of heart rate variability analysis and creating the conclusion and comments, which requires much less professional skills and training for better and faster interpretation. The KardiVAR system determines functional state of patient with resting ECG acquisition during 5 minutes.