Currently, the hydration status of human subjects is assessed through either invasive techniques, e.g. the blood sample analysis or time-consuming laboratory methods such as the analysis of urine. The aim of this study is to assess, with ultrasound, whether the diameter and the pulsatility of the inferior venca cava (IVC) can use as indicators of the hydration status. The pulsatility is expressed by the caval index (CI), which is the variation of the diameter in relation to the maximum one. The parameters were extracted with VIPER s.r.l. software using longitudinal section ultrasound videos of IVC. The software automatically tracks the IVC, allowing for parameter extraction from each frame.