Sepsis is one of the leading causes of hospital mortality, with a rate of approximately 20% (World Health Organization) among vulnerable patients admitted to high-intensity care units such as CCUs and inpatient wards. Currently, diagnostic criteria such as the Systemic Inflammatory Response Syndrome (SIRS) and the Sequential Organ Failure Assessment (SOFA) score, although widely used, lack sufficient specificity and accuracy. No established parameters are available for early and timely diagnosis. This study aims to address this gap by investigating the variability of blood plasma conductivity and dielectric constant using microwave probes previously validated for non-invasive glucose monitoring. The acquired data will be analyzed using the Anritsu VectorStar VNA to identify innovative and reliable parameters associated with the presence of severe infections.